Hi! We're also working on Heiretsu. Funnily enough, it uses the same compression algorithm that this game does (they're made by the same developer using the same SDK). I've actually done a ton of work making tooling for the game and we're basically ready to go, just lacking in translator manpower so we're completing Chokuretsu first. If you want to check out some of what we've written, you can see some of what we've done on our GitHub! https://github.com/haroohie-club/HeiretsuTranslationUtility