banteg reverse-engineers a 1995 PC-98 eroge with Codex, recovering a lost script engine
banteg · x · 2026-09-05
Yearn Finance core developer banteg published a detailed writeup of using Codex to produce an archival English translation of Fermion: Visitor from the Future, a 1995 PC-98 eroge with time travel, an elaborate ventilation maze, and a genital-renaming menu.
Key points:
- The team had to recover the game's previously undocumented script language, reconstruct the story's branching structure, and teach build tools to write English back onto a disk image the original game can read
- Bonus anecdote: a graffiti project that ran 2,000 Görli validators on an Erigon/Lighthouse setup exposed a rare block-validation bug ahead of The Merge — the origin of the 'how hentai saved the merge' story
A rare deep-dive on AI-assisted retro game translation engineering, equal parts technical and delightful.
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