# 【表紙】

【提出書類】 | 有価証券報告書
【根拠条文】 | 金融商品取引法第24条第１項
【提出先】 | 関東財務局長
【提出日】 | 2025年12月23日
【事業年度】 | 第29期（自　2024年10月１日　至　2025年９月30日）
【会社名】 | 株式会社ディ・アイ・システム
【英訳名】 | Ｄ．Ｉ．Ｓｙｓｔｅｍ Ｃｏ．， Ｌｔｄ．
【代表者の役職氏名】 | 代表取締役社長　　富田　健太郎
【本店の所在の場所】 | 東京都千代田区丸の内二丁目１番１号
【電話番号】 | 03-6826-7772
【事務連絡者氏名】 | 常務取締役　経営企画本部担当　　大塚　豊
【最寄りの連絡場所】 | 東京都千代田区丸の内二丁目１番１号
【電話番号】 | 03-6826-7772
【事務連絡者氏名】 | 常務取締役　経営企画本部担当　　大塚　豊
【縦覧に供する場所】 | 株式会社東京証券取引所 （東京都中央区日本橋兜町２番１号）

E34335 44210 株式会社ディ・アイ・システム D.I.System Co., Ltd. 企業内容等の開示に関する内閣府令 第三号様式 Japan GAAP true CTE CTE 2024-10-01 2025-09-30 FY 2025-09-30 2023-10-01 2024-09-30 2024-09-30 1 false false false E34335-000 2024-09-30 jpcrp_cor:ReportableSegmentsMember E34335-000 2024-10-01 2025-09-30 jppfs_cor:NonConsolidatedMember jppfs_cor:RetainedEarningsMember E34335-000 2024-10-01 2025-09-30 jppfs_cor:RetainedEarningsBroughtForwardMember jppfs_cor:NonConsolidatedMember E34335-000 2024-10-01 2025-09-30 jppfs_cor:GeneralReserveMember jppfs_cor:NonConsolidatedMember E34335-000 2024-10-01 2025-09-30 jppfs_cor:NonConsolidatedMember jppfs_cor:LegalRetainedEarningsMember E34335-000 2024-10-01 2025-09-30 jppfs_cor:NonConsolidatedMember jppfs_cor:CapitalSurplusMember E34335-000 2024-10-01 2025-09-30 jppfs_cor:NonConsolidatedMember jppfs_cor:LegalCapitalSurplusMember E34335-000 2024-10-01 2025-09-30 jppfs_cor:CapitalStockMember jppfs_cor:NonConsolidatedMember E34335-000 2024-09-30 jppfs_cor:NonConsolidatedMember jppfs_cor:ShareholdersEquityMember E34335-000 2024-09-30 jppfs_cor:NonConsolidatedMember jppfs_cor:RetainedEarningsMember E34335-000 2025-09-30 jpcrp_cor:ReportableSegmentsMember jppfs_cor:NonConsolidatedMember E34335-000 2025-09-30 jpcrp030000-asr_E34335-000:SystemIntegrationBusinessReportableSegmentsMember jppfs_cor:NonConsolidatedMember E34335-000 2023-09-30 jppfs_cor:TreasuryStockMember E34335-000 2024-09-30 jppfs_cor:RetainedEarningsBroughtForwardMember jppfs_cor:NonConsolidatedMember E34335-000 2024-09-30 jppfs_cor:GeneralReserveMember jppfs_cor:NonConsolidatedMember E34335-000 2025-09-30 jpcrp_cor:No8MajorShareholdersMember E34335-000 2024-09-30 jppfs_cor:NonConsolidatedMember jppfs_cor:LegalRetainedEarningsMember E34335-000 2025-09-30 jpcrp_cor:No9MajorShareholdersMember E34335-000 2025-09-30 jpcrp_cor:No7MajorShareholdersMember E34335-000 2025-09-30 jpcrp_cor:No6MajorShareholdersMember E34335-000 2025-09-30 jpcrp_cor:No5MajorShareholdersMember E34335-000 2025-09-30 jpcrp_cor:No4MajorShareholdersMember E34335-000 2025-09-30 jpcrp_cor:No3MajorShareholdersMember E34335-000 2025-09-30 jpcrp_cor:No2MajorShareholdersMember E34335-000 2025-09-30 jpcrp_cor:No1MajorShareholdersMember E34335-000 2025-09-30 jpcrp_cor:No10MajorShareholdersMember E34335-000 2025-12-23 E34335-000 2025-09-30 E34335-000 2024-09-30 E34335-000 2023-10-01 2024-09-30 E34335-000 2023-09-30 E34335-000 2022-10-01 2023-09-30 E34335-000 2022-09-30 E34335-000 2021-10-01 2022-09-30 E34335-000 2024-10-01 2025-09-30 E34335-000 2021-09-30 E34335-000 2020-10-01 2021-09-30 E34335-000 2025-12-23 jpcrp030000-asr_E34335-000:OotsukaYuitakaMember E34335-000 2025-12-23 jpcrp030000-asr_E34335-000:TatsutaYuriMember E34335-000 2023-10-01 2024-09-30 jpcrp030000-asr_E34335-000:EducationalAndSecuritySolutionBusinessReportableSegmentsMember E34335-000 2024-10-01 2025-09-30 jpcrp030000-asr_E34335-000:EducationalAndSecuritySolutionBusinessReportableSegmentsMember E34335-000 2025-09-30 jppfs_cor:NonConsolidatedMember jpcrp030000-asr_E34335-000:EducationalAndSecuritySolutionBusinessReportableSegmentsMember E34335-000 2025-09-30 jpcrp030000-asr_E34335-000:EducationalAndSecuritySolutionBusinessReportableSegmentsMember E34335-000 2024-09-30 jpcrp030000-asr_E34335-000:EducationalAndSecuritySolutionBusinessReportableSegmentsMember E34335-000 2024-09-30 jppfs_cor:NonConsolidatedMember jppfs_cor:CapitalStockMember E34335-000 2023-10-01 2024-09-30 jppfs_cor:NonConsolidatedMember jppfs_cor:ShareholdersEquityMember E34335-000 2023-10-01 2024-09-30 jppfs_cor:NonConsolidatedMember jppfs_cor:RetainedEarningsMember E34335-000 2023-10-01 2024-09-30 jppfs_cor:NonConsolidatedMember jppfs_cor:RetainedEarningsBroughtForwardMember E34335-000 2023-10-01 2024-09-30 jppfs_cor:GeneralReserveMember jppfs_cor:NonConsolidatedMember E34335-000 2023-10-01 2024-09-30 jppfs_cor:LegalRetainedEarningsMember jppfs_cor:NonConsolidatedMember E34335-000 2025-09-30 jpcrp_cor:UnallocatedAmountsAndEliminationMember E34335-000 2024-09-30 jpcrp_cor:UnallocatedAmountsAndEliminationMember E34335-000 2025-12-23 jpcrp030000-asr_E34335-000:SugitaSeiichirouMember E34335-000 2025-12-23 jpcrp030000-asr_E34335-000:KataokaShoukoMember E34335-000 2025-09-30 jppfs_cor:NonConsolidatedMember jpcrp_cor:OperatingSegmentsNotIncludedInReportableSegmentsAndOtherRevenueGeneratingBusinessActivitiesMember E34335-000 2025-09-30 jppfs_cor:NonConsolidatedMember jpcrp_cor:CorporateSharedMember E34335-000 2025-12-23 jpcrp_cor:OrdinaryShareMember E34335-000 2023-10-01 2024-09-30 jppfs_cor:NonConsolidatedMember jppfs_cor:CapitalSurplusMember E34335-000 2023-10-01 2024-09-30 jppfs_cor:LegalCapitalSurplusMember jppfs_cor:NonConsolidatedMember E34335-000 2023-09-30 jppfs_cor:NonConsolidatedMember jppfs_cor:RetainedEarningsBroughtForwardMember E34335-000 2023-10-01 2024-09-30 jppfs_cor:NonConsolidatedMember jppfs_cor:CapitalStockMember E34335-000 2023-09-30 jppfs_cor:NonConsolidatedMember jppfs_cor:ShareholdersEquityMember E34335-000 2023-09-30 jppfs_cor:NonConsolidatedMember jppfs_cor:RetainedEarningsMember E34335-000 2023-09-30 jppfs_cor:NonConsolidatedMember jppfs_cor:GeneralReserveMember E34335-000 2023-09-30 jppfs_cor:LegalRetainedEarningsMember jppfs_cor:NonConsolidatedMember E34335-000 2025-09-30 jpcrp_cor:OrdinaryShareMember E34335-000 2025-09-30 jpcrp_cor:SharesWithNoVotingRightsMember E34335-000 2025-09-30 jpcrp_cor:SharesWithRestrictedVotingRightsTreasurySharesEtcMember E34335-000 2025-09-30 jpcrp_cor:SharesWithRestrictedVotingRightsOtherMember E34335-000 2025-09-30 jpcrp_cor:SharesWithFullVotingRightsTreasurySharesEtcMember E34335-000 2025-09-30 jpcrp_cor:OrdinarySharesSharesWithFullVotingRightsTreasurySharesEtcMember E34335-000 2023-09-30 jppfs_cor:NonConsolidatedMember jppfs_cor:LegalCapitalSurplusMember E34335-000 2023-09-30 jppfs_cor:CapitalStockMember jppfs_cor:NonConsolidatedMember E34335-000 2024-10-01 2025-09-30 jppfs_cor:CapitalSurplusMember E34335-000 2023-09-30 jppfs_cor:NonConsolidatedMember jppfs_cor:CapitalSurplusMember E34335-000 2025-09-30 jpcrp_cor:SharesWithFullVotingRightsOtherMember E34335-000 2025-09-30 jpcrp_cor:OrdinarySharesSharesWithFullVotingRightsOtherMember E34335-000 2025-09-30 jpcrp_cor:SharesLessThanOneUnitMember E34335-000 2025-09-30 jpcrp_cor:OrdinarySharesSharesLessThanOneUnitMember E34335-000 2024-10-01 2025-09-30 jpcrp_cor:DirectorsExcludingAuditAndSupervisoryCommitteeMembersAndOutsideDirectorsMember E34335-000 2024-10-01 2025-09-30 jpcrp_cor:DirectorsAppointedAsAuditAndSupervisoryCommitteeMembersExcludingOutsideDirectorsMember E34335-000 2024-10-01 2025-09-30 jppfs_cor:CapitalStockMember E34335-000 2024-09-30 jppfs_cor:ValuationAndTranslationAdjustmentsMember E34335-000 2024-09-30 jppfs_cor:RemeasurementsOfDefinedBenefitPlansMember E34335-000 2024-09-30 jppfs_cor:ShareholdersEquityMember E34335-000 2024-09-30 jppfs_cor:RetainedEarningsMember E34335-000 2024-09-30 jppfs_cor:CapitalSurplusMember E34335-000 2024-09-30 jppfs_cor:CapitalStockMember E34335-000 2023-10-01 2024-09-30 jppfs_cor:ValuationAndTranslationAdjustmentsMember E34335-000 2023-10-01 2024-09-30 jppfs_cor:CapitalSurplusMember E34335-000 2023-10-01 2024-09-30 jppfs_cor:RemeasurementsOfDefinedBenefitPlansMember E34335-000 2023-10-01 2024-09-30 jppfs_cor:ShareholdersEquityMember E34335-000 2023-10-01 2024-09-30 jppfs_cor:RetainedEarningsMember E34335-000 2023-10-01 2024-09-30 jppfs_cor:CapitalStockMember E34335-000 2023-09-30 jppfs_cor:ValuationAndTranslationAdjustmentsMember E34335-000 2023-09-30 jppfs_cor:RemeasurementsOfDefinedBenefitPlansMember E34335-000 2023-09-30 jppfs_cor:ShareholdersEquityMember E34335-000 2023-09-30 jppfs_cor:RetainedEarningsMember E34335-000 2023-09-30 jppfs_cor:CapitalSurplusMember E34335-000 2023-09-30 jppfs_cor:CapitalStockMember E34335-000 2024-10-01 2025-09-30 jpcrp_cor:TotalOfReportableSegmentsAndOthersMember E34335-000 2023-10-01 2024-09-30 jpcrp_cor:TotalOfReportableSegmentsAndOthersMember E34335-000 2025-09-30 jpcrp030000-asr_E34335-000:SystemIntegrationBusinessReportableSegmentsMember E34335-000 2024-10-01 2025-09-30 jpcrp030000-asr_E34335-000:SystemIntegrationBusinessReportableSegmentsMember E34335-000 2025-12-23 jpcrp_cor:Row1Member E34335-000 2025-12-23 jpcrp_cor:Row2Member E34335-000 2025-12-23 jpcrp_cor:Row3Member E34335-000 2025-12-23 jpcrp_cor:Row4Member E34335-000 2025-12-23 jpcrp030000-asr_E34335-000:NagataMitsuhiroMember E34335-000 2025-12-23 jpcrp030000-asr_E34335-000:TomitaKentarouMember E34335-000 2025-12-23 jpcrp030000-asr_E34335-000:SekimataArihiroMember E34335-000 2024-09-30 jpcrp030000-asr_E34335-000:SystemIntegrationBusinessReportableSegmentsMember E34335-000 2023-10-01 2024-09-30 jpcrp030000-asr_E34335-000:SystemIntegrationBusinessReportableSegmentsMember E34335-000 2025-09-30 jppfs_cor:NonConsolidatedMember E34335-000 2024-10-01 2025-09-30 jppfs_cor:NonConsolidatedMember E34335-000 2024-09-30 jppfs_cor:NonConsolidatedMember E34335-000 2023-10-01 2024-09-30 jppfs_cor:NonConsolidatedMember E34335-000 2023-09-30 jppfs_cor:NonConsolidatedMember E34335-000 2022-10-01 2023-09-30 jppfs_cor:NonConsolidatedMember E34335-000 2022-09-30 jppfs_cor:NonConsolidatedMember E34335-000 2025-12-23 jpcrp030000-asr_E34335-000:YosimotoShirouMember E34335-000 2021-10-01 2022-09-30 jppfs_cor:NonConsolidatedMember E34335-000 2021-09-30 jppfs_cor:NonConsolidatedMember E34335-000 2020-10-01 2021-09-30 jppfs_cor:NonConsolidatedMember E34335-000 2025-09-30 jppfs_cor:ShareholdersEquityMember jppfs_cor:NonConsolidatedMember E34335-000 2025-09-30 jppfs_cor:NonConsolidatedMember jppfs_cor:RetainedEarningsMember E34335-000 2025-09-30 jppfs_cor:TreasuryStockMember jppfs_cor:NonConsolidatedMember E34335-000 2024-10-01 2025-09-30 jppfs_cor:NonConsolidatedMember jppfs_cor:TreasuryStockMember E34335-000 2024-09-30 jppfs_cor:NonConsolidatedMember jppfs_cor:TreasuryStockMember E34335-000 2024-10-01 2025-09-30 jpcrp_cor:OutsideDirectorsAndOtherOfficersMember E34335-000 2024-09-30 jppfs_cor:NonConsolidatedMember jppfs_cor:CapitalSurplusMember E34335-000 2024-10-01 2025-09-30 jppfs_cor:NonConsolidatedMember jppfs_cor:ShareholdersEquityMember E34335-000 2025-09-30 jppfs_cor:ValuationAndTranslationAdjustmentsMember E34335-000 2025-09-30 jppfs_cor:RemeasurementsOfDefinedBenefitPlansMember E34335-000 2025-09-30 jppfs_cor:ShareholdersEquityMember E34335-000 2025-09-30 jppfs_cor:RetainedEarningsMember E34335-000 2025-09-30 jppfs_cor:NonConsolidatedMember jppfs_cor:RetainedEarningsBroughtForwardMember E34335-000 2025-09-30 jppfs_cor:LegalCapitalSurplusMember jppfs_cor:NonConsolidatedMember E34335-000 2025-09-30 jppfs_cor:NonConsolidatedMember jppfs_cor:GeneralReserveMember E34335-000 2025-09-30 jppfs_cor:LegalRetainedEarningsMember jppfs_cor:NonConsolidatedMember E34335-000 2025-09-30 jppfs_cor:NonConsolidatedMember jppfs_cor:CapitalSurplusMember E34335-000 2025-09-30 jppfs_cor:NonConsolidatedMember jppfs_cor:CapitalStockMember E34335-000 2025-09-30 jppfs_cor:CapitalSurplusMember E34335-000 2025-09-30 jppfs_cor:CapitalStockMember E34335-000 2024-10-01 2025-09-30 jppfs_cor:ValuationAndTranslationAdjustmentsMember E34335-000 2024-10-01 2025-09-30 jppfs_cor:RemeasurementsOfDefinedBenefitPlansMember E34335-000 2024-10-01 2025-09-30 jppfs_cor:ShareholdersEquityMember E34335-000 2024-10-01 2025-09-30 jppfs_cor:RetainedEarningsMember E34335-000 2024-09-30 jppfs_cor:NonConsolidatedMember jppfs_cor:LegalCapitalSurplusMember E34335-000 2023-10-01 2024-09-30 jppfs_cor:TreasuryStockMember E34335-000 2025-09-30 jpcrp_cor:Row1Member E34335-000 2023-10-01 2024-09-30 jppfs_cor:NonConsolidatedMember jppfs_cor:TreasuryStockMember E34335-000 2023-09-30 jppfs_cor:NonConsolidatedMember jppfs_cor:TreasuryStockMember E34335-000 2025-09-30 jppfs_cor:TreasuryStockMember E34335-000 2024-10-01 2025-09-30 jppfs_cor:TreasuryStockMember E34335-000 2024-09-30 jppfs_cor:TreasuryStockMember E34335-000 2025-09-30 jpcrp_cor:ReportableSegmentsMember E34335-000 2025-09-30 jpcrp_cor:OperatingSegmentsNotIncludedInReportableSegmentsAndOtherRevenueGeneratingBusinessActivitiesMember E34335-000 2025-09-30 jpcrp_cor:CorporateSharedMember E34335-000 2025-12-23 jpcrp030000-asr_E34335-000:NakaMaikoMember E34335-000 2025-12-23 jpcrp030000-asr_E34335-000:TsutsuiKeikoMember iso4217:JPY xbrli:shares iso4217:JPY xbrli:shares xbrli:pure