The Japanese ringi seido is not a workflow to optimise around — it is the consensus-decision substrate on which the firm's J-SOX internal-control framework rests, and an agentic AI deployed without ringi-aware architecture fails the audit committee's review on first sample. This article walks the engineering deliverables: deterministic decision classifier reading the internal-control manifest; structured nemawashi surface for pre-circulation; agent-generated Japanese ringisho from internal-control-approved templates; electronic hanko circulation integrated with the firm's approval system; chain-of-approval execution gate; decision-narrative audit trail composed with J-SOX retention. 8 anti-patterns, 5-stage maturity ladder, portable to Korean chaebol gyeolje, Taiwanese family-business consensus, and broader multi-approver enterprise decision cultures.