Schedule of Valuation Allowance for Net Deferred Tax Assets (Details) - JPY (¥) ¥ in Thousands	12 Months Ended
Mar. 31, 2026	Mar. 31, 2025
Income Tax Disclosure [Abstract]
Valuation allowance at beginning of year	¥ 572,111	¥ 378,709
Additions (deductions)	186,057	193,402
Valuation allowance at end of year	¥ 758,168	¥ 572,111

Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482685/740-10-50-2

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant