Annual report

Period2025-04-01 → 2026-03-31
Filed2026-06-23
StandardJapan GAAP
ConsolidatedYes
Data checks24 of 24 passed
Key figures · 146
MetricValuePeriodScopeSource row
Revenue¥6.8bn2025-04-01 → 2026-03-31Cons.Net sales
Revenue¥7.2bn2024-04-01 → 2025-03-31Cons.Net sales
Revenue¥7.5bn2023-04-01 → 2024-03-31vCons.Net sales (5-year summary)
Revenue¥8.1bn2022-04-01 → 2023-03-31vCons.Net sales (5-year summary)
Revenue¥8.1bn2021-04-01 → 2022-03-31vCons.Net sales (5-year summary)
Operating income¥416m2025-04-01 → 2026-03-31Cons.Operating income
Operating income¥209m2024-04-01 → 2025-03-31Cons.Operating income
Ordinary income¥338m2025-04-01 → 2026-03-31Cons.Ordinary income
Ordinary income¥171m2024-04-01 → 2025-03-31Cons.Ordinary income
Ordinary income¥382m2023-04-01 → 2024-03-31vCons.Ordinary income loss (5-year summary)
Ordinary income¥730m2022-04-01 → 2023-03-31vCons.Ordinary income loss (5-year summary)
Ordinary income¥486m2021-04-01 → 2022-03-31vCons.Ordinary income loss (5-year summary)
Profit before tax¥107m2025-04-01 → 2026-03-31Cons.Income before income taxes
Profit before tax¥383m2024-04-01 → 2025-03-31Cons.Income before income taxes
Net income (owners)¥64m2025-04-01 → 2026-03-31Cons.Profit loss attributable to owners of parent
Net income (owners)¥298m2024-04-01 → 2025-03-31Cons.Profit loss attributable to owners of parent
Net income (owners)¥290m2023-04-01 → 2024-03-31vCons.Profit loss attributable to owners of parent (5-year summary)
Net income (owners)¥517m2022-04-01 → 2023-03-31vCons.Profit loss attributable to owners of parent (5-year summary)
Net income (owners)−¥143m2021-04-01 → 2022-03-31vCons.Profit loss attributable to owners of parent (5-year summary)
Net income¥64m2025-04-01 → 2026-03-31Cons.Profit loss
Net income¥298m2024-04-01 → 2025-03-31Cons.Profit loss
Total assets¥10.3bnat 2026-03-31Cons.Assets
Total assets¥11.1bnat 2025-03-31Cons.Assets
Total assets¥11.3bnat 2024-03-31vCons.Total assets (5-year summary)
Total assets¥11.5bnat 2023-03-31vCons.Total assets (5-year summary)
Total assets¥11.8bnat 2022-03-31vCons.Total assets (5-year summary)
Total liabilities¥6.2bnat 2026-03-31Cons.Liabilities
Total liabilities¥7.0bnat 2025-03-31Cons.Liabilities
Net assets / equity¥4.0bnat 2026-03-31Cons.Net assets
Net assets / equity¥4.1bnat 2025-03-31Cons.Net assets
Net assets / equity¥3.9bnat 2024-03-31vCons.Net assets
Net assets / equity¥3.6bnat 2023-03-31vCons.Net assets (5-year summary)
Net assets / equity¥3.1bnat 2022-03-31vCons.Net assets (5-year summary)
Cash and deposits¥2.3bnat 2026-03-31Cons.Cash and deposits
Cash and deposits¥2.3bnat 2025-03-31Cons.Cash and deposits
Cash & equivalents¥2.2bnat 2026-03-31Cons.Cash and cash equivalents
Cash & equivalents¥2.0bnat 2025-03-31Cons.Cash and cash equivalents
Cash & equivalents¥1.4bnat 2024-03-31vCons.Cash and cash equivalents
Cash & equivalents¥1.6bnat 2023-03-31vCons.Cash and cash equivalents (5-year summary)
Cash & equivalents¥1.6bnat 2022-03-31vCons.Cash and cash equivalents (5-year summary)
Operating cash flow¥623m2025-04-01 → 2026-03-31Cons.Net cash provided by used in operating activities
Operating cash flow¥634m2024-04-01 → 2025-03-31Cons.Net cash provided by used in operating activities
Operating cash flow¥211m2023-04-01 → 2024-03-31vCons.Net cash provided by used in operating activities (5-year summary)
Operating cash flow¥772m2022-04-01 → 2023-03-31vCons.Net cash provided by used in operating activities (5-year summary)
Operating cash flow¥1.2bn2021-04-01 → 2022-03-31vCons.Net cash provided by used in operating activities (5-year summary)
Investing cash flow−¥57m2025-04-01 → 2026-03-31Cons.Net cash provided by used in investment activities
Investing cash flow¥278m2024-04-01 → 2025-03-31Cons.Net cash provided by used in investment activities
Investing cash flow−¥123m2023-04-01 → 2024-03-31vCons.Net cash provided by used in investing activities (5-year summary)
Investing cash flow−¥76m2022-04-01 → 2023-03-31vCons.Net cash provided by used in investing activities (5-year summary)
Investing cash flow−¥152m2021-04-01 → 2022-03-31vCons.Net cash provided by used in investing activities (5-year summary)
Financing cash flow−¥333m2025-04-01 → 2026-03-31Cons.Net cash provided by used in financing activities
Financing cash flow−¥282m2024-04-01 → 2025-03-31Cons.Net cash provided by used in financing activities
Financing cash flow−¥347m2023-04-01 → 2024-03-31vCons.Net cash provided by used in financing activities (5-year summary)
Financing cash flow−¥676m2022-04-01 → 2023-03-31vCons.Net cash provided by used in financing activities (5-year summary)
Financing cash flow−¥803m2021-04-01 → 2022-03-31vCons.Net cash provided by used in financing activities (5-year summary)
EPS (basic)¥50.22025-04-01 → 2026-03-31Cons.Basic earnings loss per share (5-year summary)
EPS (basic)¥235.192024-04-01 → 2025-03-31Cons.Basic earnings loss per share (5-year summary)
EPS (basic)¥228.422023-04-01 → 2024-03-31vCons.Basic earnings loss per share (5-year summary)
EPS (basic)¥407.892022-04-01 → 2023-03-31vCons.Basic earnings loss per share (5-year summary)
EPS (basic)¥-112.562021-04-01 → 2022-03-31vCons.Basic earnings loss per share (5-year summary)
Net assets per share¥3,193.01at 2026-03-31Cons.Net assets per share (5-year summary)
Net assets per share¥3,209.1at 2025-03-31Cons.Net assets per share (5-year summary)
Net assets per share¥3,042.65at 2024-03-31vCons.Net assets per share (5-year summary)
Net assets per share¥2,820.6at 2023-03-31vCons.Net assets per share (5-year summary)
Net assets per share¥2,442.65at 2022-03-31vCons.Net assets per share (5-year summary)
Equity ratio39.4%at 2026-03-31Cons.Equity to asset ratio (5-year summary)
Equity ratio36.8%at 2025-03-31Cons.Equity to asset ratio (5-year summary)
Equity ratio34.1%at 2024-03-31vCons.Equity to asset ratio (5-year summary)
Equity ratio31.2%at 2023-03-31vCons.Equity to asset ratio (5-year summary)
Equity ratio26.2%at 2022-03-31vCons.Equity to asset ratio (5-year summary)
ROE1.6%2025-04-01 → 2026-03-31Cons.Rate of return on equity (5-year summary)
ROE7.5%2024-04-01 → 2025-03-31Cons.Rate of return on equity (5-year summary)
ROE7.8%2023-04-01 → 2024-03-31vCons.Rate of return on equity (5-year summary)
ROE15.5%2022-04-01 → 2023-03-31vCons.Rate of return on equity (5-year summary)
Employees253at 2026-03-31Cons.Number of employees
Employees250at 2025-03-31Cons.Number of employees
Employees278at 2024-03-31vCons.Number of employees
Employees276at 2023-03-31vCons.Number of employees
Employees287at 2022-03-31vCons.Number of employees
Revenue¥6.7bn2025-04-01 → 2026-03-31StandaloneNet sales
Revenue¥7.1bn2024-04-01 → 2025-03-31StandaloneNet sales
Revenue¥7.4bn2023-04-01 → 2024-03-31vStandaloneNet sales (5-year summary)
Revenue¥8.0bn2022-04-01 → 2023-03-31vStandaloneNet sales (5-year summary)
Revenue¥8.1bn2021-04-01 → 2022-03-31vStandaloneNet sales (5-year summary)
Operating income¥423m2025-04-01 → 2026-03-31StandaloneOperating income
Operating income¥204m2024-04-01 → 2025-03-31StandaloneOperating income
Ordinary income¥346m2025-04-01 → 2026-03-31StandaloneOrdinary income
Ordinary income¥167m2024-04-01 → 2025-03-31StandaloneOrdinary income
Ordinary income¥370m2023-04-01 → 2024-03-31vStandaloneOrdinary income loss (5-year summary)
Ordinary income¥714m2022-04-01 → 2023-03-31vStandaloneOrdinary income loss (5-year summary)
Ordinary income¥496m2021-04-01 → 2022-03-31vStandaloneOrdinary income loss (5-year summary)
Profit before tax¥115m2025-04-01 → 2026-03-31StandaloneIncome before income taxes
Profit before tax¥379m2024-04-01 → 2025-03-31StandaloneIncome before income taxes
Net income¥71m2025-04-01 → 2026-03-31StandaloneProfit loss
Net income¥297m2024-04-01 → 2025-03-31StandaloneProfit loss
Net income¥283m2023-04-01 → 2024-03-31vStandaloneNet income loss (5-year summary)
Net income¥504m2022-04-01 → 2023-03-31vStandaloneNet income loss (5-year summary)
Net income−¥167m2021-04-01 → 2022-03-31vStandaloneNet income loss (5-year summary)
Total assets¥10.1bnat 2026-03-31StandaloneAssets
Total assets¥10.9bnat 2025-03-31StandaloneAssets
Total assets¥11.2bnat 2024-03-31vStandaloneTotal assets (5-year summary)
Total assets¥11.4bnat 2023-03-31vStandaloneTotal assets (5-year summary)
Total assets¥11.7bnat 2022-03-31vStandaloneTotal assets (5-year summary)
Total liabilities¥6.2bnat 2026-03-31StandaloneLiabilities
Total liabilities¥7.0bnat 2025-03-31StandaloneLiabilities
Net assets / equity¥3.9bnat 2026-03-31StandaloneNet assets
Net assets / equity¥3.9bnat 2025-03-31StandaloneNet assets
Net assets / equity¥3.8bnat 2024-03-31vStandaloneNet assets
Net assets / equity¥3.5bnat 2023-03-31vStandaloneNet assets (5-year summary)
Net assets / equity¥3.0bnat 2022-03-31vStandaloneNet assets (5-year summary)
Cash and deposits¥2.0bnat 2026-03-31StandaloneCash and deposits
Cash and deposits¥2.1bnat 2025-03-31StandaloneCash and deposits
EPS (basic)¥55.972025-04-01 → 2026-03-31StandaloneBasic earnings loss per share (5-year summary)
EPS (basic)¥234.592024-04-01 → 2025-03-31StandaloneBasic earnings loss per share (5-year summary)
EPS (basic)¥223.352023-04-01 → 2024-03-31vStandaloneBasic earnings loss per share (5-year summary)
EPS (basic)¥397.232022-04-01 → 2023-03-31vStandaloneBasic earnings loss per share (5-year summary)
EPS (basic)¥-131.922021-04-01 → 2022-03-31vStandaloneBasic earnings loss per share (5-year summary)
Dividend per share¥812025-04-01 → 2026-03-31StandaloneDividend paid per share (5-year summary)
Dividend per share¥782024-04-01 → 2025-03-31StandaloneDividend paid per share (5-year summary)
Dividend per share¥502023-04-01 → 2024-03-31vStandaloneDividend paid per share (5-year summary)
Dividend per share¥502022-04-01 → 2023-03-31vStandaloneDividend paid per share (5-year summary)
Dividend per share¥502021-04-01 → 2022-03-31vStandaloneDividend paid per share (5-year summary)
Net assets per share¥3,082.89at 2026-03-31StandaloneNet assets per share (5-year summary)
Net assets per share¥3,091.45at 2025-03-31StandaloneNet assets per share (5-year summary)
Net assets per share¥2,964.09at 2024-03-31vStandaloneNet assets per share (5-year summary)
Net assets per share¥2,760.74at 2023-03-31vStandaloneNet assets per share (5-year summary)
Net assets per share¥2,388.09at 2022-03-31vStandaloneNet assets per share (5-year summary)
Equity ratio38.6%at 2026-03-31StandaloneEquity to asset ratio (5-year summary)
Equity ratio35.8%at 2025-03-31StandaloneEquity to asset ratio (5-year summary)
Equity ratio33.5%at 2024-03-31vStandaloneEquity to asset ratio (5-year summary)
Equity ratio30.8%at 2023-03-31vStandaloneEquity to asset ratio (5-year summary)
Equity ratio25.8%at 2022-03-31vStandaloneEquity to asset ratio (5-year summary)
ROE1.8%2025-04-01 → 2026-03-31StandaloneRate of return on equity (5-year summary)
ROE7.7%2024-04-01 → 2025-03-31StandaloneRate of return on equity (5-year summary)
ROE7.8%2023-04-01 → 2024-03-31vStandaloneRate of return on equity (5-year summary)
ROE15.4%2022-04-01 → 2023-03-31vStandaloneRate of return on equity (5-year summary)
Shares issued1,286,199at 2026-03-31StandaloneTotal number of issued shares (5-year summary)
Shares issued1,286,199at 2025-03-31StandaloneTotal number of issued shares (5-year summary)
Shares issued1,286,199at 2024-03-31vStandaloneTotal number of issued shares (5-year summary)
Shares issued1,286,199at 2023-03-31vStandaloneTotal number of issued shares (5-year summary)
Shares issued1,286,199at 2022-03-31vStandaloneTotal number of issued shares (5-year summary)
Employees247at 2026-03-31StandaloneNumber of employees
Employees245at 2025-03-31StandaloneNumber of employees
Employees272at 2024-03-31vStandaloneNumber of employees
Employees272at 2023-03-31vStandaloneNumber of employees
Employees281at 2022-03-31vStandaloneNumber of employees

Periods use the dates stated in the filing. d = earlier-year period dated by calendar; v = that date confirmed by the company's own earlier filing.

Segments · 60
SegmentItemPeriodValue
Reconciling Itemsreconcilingcapex2025-04-01 → 2026-03-31¥24m
Reconciling Itemsreconcilingdepreciation2025-04-01 → 2026-03-31¥18m
Reconciling Itemsreconcilingsegment assetsat 2026-03-31¥3.3bn
Reconciling Itemsreconcilingsegment profit2025-04-01 → 2026-03-31−¥495m
Medical Equipmentreportable segmentcapex2025-04-01 → 2026-03-31¥41m
Medical Equipmentreportable segmentdepreciation2025-04-01 → 2026-03-31¥106m
Medical Equipmentreportable segmentemployeesat 2026-03-3179 pure
Medical Equipmentreportable segmentrevenue2025-04-01 → 2026-03-31¥2.1bn
Medical Equipmentreportable segmentrevenue external2025-04-01 → 2026-03-31¥2.1bn
Medical Equipmentreportable segmentsegment assetsat 2026-03-31¥2.8bn
Medical Equipmentreportable segmentsegment profit2025-04-01 → 2026-03-31¥59m
Precision Equipmentreportable segmentcapex2025-04-01 → 2026-03-31¥284m
Precision Equipmentreportable segmentdepreciation2025-04-01 → 2026-03-31¥120m
Precision Equipmentreportable segmentemployeesat 2026-03-31124 pure
Precision Equipmentreportable segmentrevenue2025-04-01 → 2026-03-31¥4.4bn
Precision Equipmentreportable segmentrevenue external2025-04-01 → 2026-03-31¥4.4bn
Precision Equipmentreportable segmentsegment assetsat 2026-03-31¥3.4bn
Precision Equipmentreportable segmentsegment profit2025-04-01 → 2026-03-31¥1.0bn
SP Divisionreportable segmentdepreciation2025-04-01 → 2026-03-31¥24,000
SP Divisionreportable segmentemployeesat 2026-03-312 pure
SP Divisionreportable segmentrevenue2025-04-01 → 2026-03-31¥87m
SP Divisionreportable segmentrevenue external2025-04-01 → 2026-03-31¥87m
SP Divisionreportable segmentsegment assetsat 2026-03-31¥79m
SP Divisionreportable segmentsegment profit2025-04-01 → 2026-03-31−¥52m
Total Of Reportable Segments And Otherssegment totalcapex2025-04-01 → 2026-03-31¥333m
Total Of Reportable Segments And Otherssegment totaldepreciation2025-04-01 → 2026-03-31¥272m
Total Of Reportable Segments And Otherssegment totalrevenue2025-04-01 → 2026-03-31¥6.8bn
Total Of Reportable Segments And Otherssegment totalrevenue external2025-04-01 → 2026-03-31¥6.8bn
Total Of Reportable Segments And Otherssegment totalsegment assetsat 2026-03-31¥6.9bn
Total Of Reportable Segments And Otherssegment totalsegment profit2025-04-01 → 2026-03-31¥911m
Reconciling Itemsreconcilingcapex2024-04-01 → 2025-03-31¥6m
Reconciling Itemsreconcilingdepreciation2024-04-01 → 2025-03-31¥16m
Reconciling Itemsreconcilingsegment assetsat 2025-03-31¥3.3bn
Reconciling Itemsreconcilingsegment profit2024-04-01 → 2025-03-31−¥455m
Medical Equipmentreportable segmentcapex2024-04-01 → 2025-03-31¥43m
Medical Equipmentreportable segmentdepreciation2024-04-01 → 2025-03-31¥104m
Medical Equipmentreportable segmentrevenue2024-04-01 → 2025-03-31¥2.5bn
Medical Equipmentreportable segmentrevenue external2024-04-01 → 2025-03-31¥2.5bn
Medical Equipmentreportable segmentsegment assetsat 2025-03-31¥3.5bn
Medical Equipmentreportable segmentsegment profit2024-04-01 → 2025-03-31¥8m
Precision Equipmentreportable segmentcapex2024-04-01 → 2025-03-31¥77m
Precision Equipmentreportable segmentdepreciation2024-04-01 → 2025-03-31¥141m
Precision Equipmentreportable segmentrevenue2024-04-01 → 2025-03-31¥4.1bn
Precision Equipmentreportable segmentrevenue external2024-04-01 → 2025-03-31¥4.1bn
Precision Equipmentreportable segmentsegment assetsat 2025-03-31¥3.6bn
Precision Equipmentreportable segmentsegment profit2024-04-01 → 2025-03-31¥710m
SP Divisionreportable segmentdepreciation2024-04-01 → 2025-03-31¥24,000
SP Divisionreportable segmentrevenue2024-04-01 → 2025-03-31¥390m
SP Divisionreportable segmentrevenue external2024-04-01 → 2025-03-31¥390m
SP Divisionreportable segmentsegment assetsat 2025-03-31¥84m
SP Divisionreportable segmentsegment profit2024-04-01 → 2025-03-31−¥23m
Total Of Reportable Segments And Otherssegment totalcapex2024-04-01 → 2025-03-31¥217m
Total Of Reportable Segments And Otherssegment totaldepreciation2024-04-01 → 2025-03-31¥271m
Total Of Reportable Segments And Otherssegment totalrevenue2024-04-01 → 2025-03-31¥7.2bn
Total Of Reportable Segments And Otherssegment totalrevenue external2024-04-01 → 2025-03-31¥7.2bn
Total Of Reportable Segments And Otherssegment totalsegment assetsat 2025-03-31¥7.8bn
Total Of Reportable Segments And Otherssegment totalsegment profit2024-04-01 → 2025-03-31¥664m
Medical Equipmentreportable segmentemployeesat 2026-03-3177 pure
Precision Equipmentreportable segmentemployeesat 2026-03-31120 pure
SP Divisionreportable segmentemployeesat 2026-03-312 pure

Segment names come from EDINET member IDs; not yet mapped to a common taxonomy.

All source rows · 1,666
ItemContextValueUnit
Deferred assetsPrior1YearInstant3449000JPY
Deferred assetsCurrentYearInstant1421000JPY
AssetsPrior1YearInstant11056289000JPY
AssetsCurrentYearInstant10270063000JPY
Notes and accounts payable tradePrior1YearInstant240130000JPY
Notes and accounts payable tradeCurrentYearInstant233075000JPY
Electronically recorded obligations operating clPrior1YearInstant682681000JPY
Electronically recorded obligations operating clCurrentYearInstant59217000JPY
Short term loans payablePrior1YearInstant2888000000JPY
Short term loans payableCurrentYearInstant2678000000JPY
Current portion of bondsPrior1YearInstant-JPY
Current portion of bondsCurrentYearInstant400000000JPY
Current portion of long term loans payablePrior1YearInstant326332000JPY
Current portion of long term loans payableCurrentYearInstant406332000JPY
Lease obligations clPrior1YearInstant75211000JPY
Lease obligations clCurrentYearInstant41682000JPY
Income taxes payablePrior1YearInstant-JPY
Income taxes payableCurrentYearInstant112611000JPY
Accrued consumption taxesPrior1YearInstant49195000JPY
Accrued consumption taxesCurrentYearInstant56385000JPY
Accrued expensesPrior1YearInstant201091000JPY
Accrued expensesCurrentYearInstant194295000JPY
Provision for bonusesPrior1YearInstant210079000JPY
Provision for bonusesCurrentYearInstant215233000JPY
Electronically recorded obligations facilities clPrior1YearInstant8995000JPY
Electronically recorded obligations facilities clCurrentYearInstant1606000JPY
Other clPrior1YearInstant130433000JPY
Other clCurrentYearInstant177156000JPY
Current liabilitiesPrior1YearInstant4812151000JPY
Current liabilitiesCurrentYearInstant4575595000JPY
Bonds payablePrior1YearInstant400000000JPY
Bonds payableCurrentYearInstant-JPY
Long term loans payablePrior1YearInstant1466192000JPY
Long term loans payableCurrentYearInstant1419860000JPY
Lease obligations nclPrior1YearInstant150073000JPY
Lease obligations nclCurrentYearInstant108390000JPY
Deferred tax liabilities for land revaluationPrior1YearInstant130854000JPY
Deferred tax liabilities for land revaluationCurrentYearInstant93522000JPY
Net defined benefit liabilityPrior1YearInstant8315000JPY
Net defined benefit liabilityCurrentYearInstant6296000JPY
Other nclPrior1YearInstant20638000JPY
Other nclCurrentYearInstant19510000JPY
Noncurrent liabilitiesPrior1YearInstant2176074000JPY
Noncurrent liabilitiesCurrentYearInstant1647579000JPY
LiabilitiesPrior1YearInstant6988225000JPY
LiabilitiesCurrentYearInstant6223175000JPY
Capital stockPrior1YearInstant643099000JPY
Capital stockCurrentYearInstant643099000JPY
Capital surplusPrior1YearInstant248362000JPY
Capital surplusCurrentYearInstant248362000JPY

Every row of the EDINET CSV. Item names are the XBRL element names; filed text is kept in its original Japanese. Filed text is available on Plus and Pro.

Data checks · 24 of 24 passed
balance sheet identityconsolidated 2025-03-31pass
balance sheet identityconsolidated 2026-03-31pass
balance sheet identitynon_consolidated 2025-03-31pass rounding
balance sheet identitynon_consolidated 2026-03-31pass rounding
dei present pass
period resolution pass
statement vs summary · net assetsconsolidated 2024-03-31pass
statement vs summary · net assetsconsolidated 2025-03-31pass
statement vs summary · net assetsconsolidated 2026-03-31pass
statement vs summary · net assetsnon_consolidated 2024-03-31pass
statement vs summary · net assetsnon_consolidated 2025-03-31pass
statement vs summary · net assetsnon_consolidated 2026-03-31pass
statement vs summary · net income attributable to parentconsolidated 2024-04-01/2025-03-31pass
statement vs summary · net income attributable to parentconsolidated 2025-04-01/2026-03-31pass
statement vs summary · operating cash flowconsolidated 2024-04-01/2025-03-31pass
statement vs summary · operating cash flowconsolidated 2025-04-01/2026-03-31pass
statement vs summary · revenueconsolidated 2024-04-01/2025-03-31pass
statement vs summary · revenueconsolidated 2025-04-01/2026-03-31pass
statement vs summary · revenuenon_consolidated 2024-04-01/2025-03-31pass
statement vs summary · revenuenon_consolidated 2025-04-01/2026-03-31pass
statement vs summary · total assetsconsolidated 2025-03-31pass
statement vs summary · total assetsconsolidated 2026-03-31pass
statement vs summary · total assetsnon_consolidated 2025-03-31pass
statement vs summary · total assetsnon_consolidated 2026-03-31pass