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Leases - Schedule of Lease Costs (Details) - JPY (¥)
¥ in Thousands
6 Months Ended
Mar. 31, 2025
Sep. 30, 2024
Right-of-Use Assets    
Operating lease assets ¥ 7,685 ¥ 10,465
Lease Liabilities    
Operating lease liabilities - Current (5,453) (5,414)
Operating lease liabilities - Non-Current ¥ (1,638) ¥ (4,375)
Weighted average remaining lease term (years) 1 year 3 months 18 days 1 year 9 months 18 days
Weighted average discount rate 1.45% 1.45%
Office (Akasaka) [Member]    
Schedule of Lease Costs [Line Items]    
Lease Period October 1, 2022 to March 31, 2026  
Residence (Harumi) [Member]    
Schedule of Lease Costs [Line Items]    
Lease Period September 18, 2024 to September 17, 2026