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v3.26.1

Supplemental cash flow information (Details) - JPY (¥) ¥ in Millions | 12 Months Ended |
--- | --- | ---
Mar. 31, 2026 | Mar. 31, 2025 | Mar. 31, 2024 | Mar. 14, 2025
Changes in liabilities arising from financing activities [abstract] |  |  |  |
Liabilities arising from financing activities at beginning of period | ¥ 2,028 | ¥ 1,661 | ¥ 350 |
Proceeds from short-term loans payable | 3,000 | 1,800 | 1,200 |
Repayments of short-term loans payable | (3,041) | (1,800) | (1,200) |
Repayments of lease obligations |  | (463) | (327) |
Repayments of lease obligations | (378) | (463) | (327) |
Proceeds from loan from related party | 19,376 | 8,508 | 0 |
Repayments of loan from related party | (17,758) | (7,887) | 0 |
Total changes from financing cash flows | 1,200 | 158 | (327) |
Modification of lease term |  | 79 | (81) |
New lease contracts |  | 130 | 1,719 |
Increase by business combination | 275 |  |  |
Interest expense | 161 | 31 | 5 |
Interest paid | (153) | (31) | (5) |
Foreign currency translation | (166) |  |  |
Total liability-related other changes | 449 | 209 | 1,638 |
Liabilities arising from financing activities at end of period | 3,677 | 2,028 | 1,661 |
Right-of-use assets obtained in exchange for lease liabilities | 1,638 | 79 | 11 |
Intangible assets | 2,347 |  |  |
Next Finance Tech Co, Ltd. |  |  |  |
Changes in liabilities arising from financing activities [abstract] |  |  |  |
Intangible assets |  |  |  | ¥ 5
Ordinary shares of Coincheck Parent |  |  |  | ¥ 1,077
Aplo and 3iQ |  |  |  |
Changes in liabilities arising from financing activities [abstract] |  |  |  |
Ordinary shares of Coincheck Parent | 13,935 |  |  |
Loans |  |  |  |
Changes in liabilities arising from financing activities [abstract] |  |  |  |
Liabilities arising from financing activities at beginning of period | 751 | 0 | 0 |
Proceeds from short-term loans payable | 3,000 | 1,800 | 1,200 |
Repayments of short-term loans payable | (3,041) | (1,800) | (1,200) |
Repayments of lease obligations |  | 0 | 0 |
Repayments of lease obligations | 0 |  |  |
Proceeds from loan from related party | 19,376 | 8,508 |  |
Repayments of loan from related party | (17,758) | (7,759) |  |
Total changes from financing cash flows | 1,577 | 749 | 0 |
Modification of lease term |  | 0 | 0 |
New lease contracts |  | 2 | 0 |
Increase by business combination | 264 |  |  |
Interest expense | 153 | 21 | 0 |
Interest paid | (145) | (21) | 0 |
Foreign currency translation | (166) |  |  |
Total liability-related other changes | 438 | 2 | 0 |
Liabilities arising from financing activities at end of period | 2,767 | 751 | 0 |
Promissory note- related party |  |  |  |
Changes in liabilities arising from financing activities [abstract] |  |  |  |
Liabilities arising from financing activities at beginning of period | 0 | 0 | 0 |
Proceeds from short-term loans payable | 0 | 0 | 0 |
Repayments of short-term loans payable | 0 | 0 | 0 |
Repayments of lease obligations |  | 0 | 0 |
Repayments of lease obligations | 0 |  |  |
Proceeds from loan from related party | 0 | 0 |  |
Repayments of loan from related party | 0 | (128) |  |
Total changes from financing cash flows | 0 | (128) | 0 |
Modification of lease term |  | 0 | 0 |
New lease contracts |  | 128 | 0 |
Increase by business combination | 0 |  |  |
Interest expense | 0 | 0 | 0 |
Interest paid | 0 | 0 | 0 |
Foreign currency translation | 0 |  |  |
Total liability-related other changes | 0 | 128 | 0 |
Liabilities arising from financing activities at end of period | 0 | 0 | 0 |
Lease liabilities |  |  |  |
Changes in liabilities arising from financing activities [abstract] |  |  |  |
Liabilities arising from financing activities at beginning of period | 1,277 | 1,661 | 350 |
Proceeds from short-term loans payable | 0 | 0 | 0 |
Repayments of short-term loans payable | 0 | 0 | 0 |
Repayments of lease obligations |  | (463) | (327) |
Repayments of lease obligations | (378) |  |  |
Proceeds from loan from related party | 0 | 0 |  |
Repayments of loan from related party | 0 | 0 |  |
Total changes from financing cash flows | (378) | (463) | (327) |
Modification of lease term |  | 79 | (81) |
New lease contracts |  | 0 | 1,719 |
Increase by business combination | 11 |  |  |
Interest expense | 8 | 10 | 5 |
Interest paid | (8) | (10) | (5) |
Foreign currency translation | 0 |  |  |
Total liability-related other changes | 11 | 79 | 1,638 |
Liabilities arising from financing activities at end of period | ¥ 910 | ¥ 1,277 | ¥ 1,661 |

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