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v3.26.1

Related parties - Compensation for the Company’s key management personnel (Details) - JPY (¥) ¥ in Millions | 12 Months Ended
--- | ---
Mar. 31, 2026 | Mar. 31, 2025 | Mar. 31, 2024
Related Party [Abstract] |  |  |
Short-term employee benefits | ¥ 353 | ¥ 291 | ¥ 66
Termination benefits | 282 | 0 | 0
Share-based payments | 283 | 0 | 0
Total | ¥ 918 | ¥ 291 | ¥ 66

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