A major Japanese console manufacturer simultaneously distributed paid DLC 'Edo Currency Expansion' in May 2026 for three major RPG titles, incorporating Edo period monetary circulation as game mechanics. With numismatic scholars handling historical verification and implementing actual circulation logic of Kanei Tsuho, Tempo Tsuho, and Kyoho Koban into the in-game currency system, downloads exceeded 1.2 million within 24 hours of release.