Ren uncovers that Aiko’s “inking technique” was used to hide a map in a 1983 Sega arcade game, The Courtesan’s Path , a cult classic where players solve puzzles inspired by Edo-period poetry. The game’s code, buried in outdated floppy disks, holds clues to a lost oiran ledger containing secrets about Aiko’s disappearance. As Ren deciphers the game’s code, Aiko’s spirit emerges, bound to the 1983 technology. She reveals she died in 1897, faking her demise to escape a forced marriage, and used her knowledge of ink chemistry to encode her story for future discovery. The “update” she sought was a bridge between eras—a way to preserve her legacy as Japan modernized.