I caught Ikeda's stream last night and recorded some clips since they are not archived. He was working on paizuri and fellatio animations. Sadly, I only watched like an hour of the stream and recorded even less, because I had to get up early today, stream was around midnight where I live.
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I also took the time to ask what his inspiration for the game was, since I see a lot of people here lack critical thinking and jumped to conclusions, because they watched a 6 hour video essay about a game the dev might have never played. Sadly I forgot to turn on audio recording on OBS in the first two videos (iokv7u.mkv & xyskhe.mkv) because of a previous project I did and the response was lost, but with my little knowledge of japanese (I've been learning for about a year with Duolingo and the Genki books) I could understand that he likes 'simulation' games and that he has liked erogames and wanted to do one or has been making them since he was in high school. He didn't quote any games as inspiration but the truth is that he might or might not have played that PS1 game or even know it exists, it's not conclusive evidence and doesn't really change anything to be honest, just simple curiosity.