Hey man, have you tried Scarlet Law and Out of Touch?
Scarlet Law has interesting story and beautiful models, but the developer already has an abandoned project, so dont get too invested. Its a shame because the game looks really promising, so hopefully the abandoned game (which was amazing too) was due to copyright with Nintendo only and not the typical Patreon scam.
Out of Touch is ....special. To me it is the Koikatsu Midnight Paradise. Some of the most beautiful models I have seen with koikatsu, amazing music, really good story, it is quite lengthy already but.......no sex, and almost no nudity YET. Dev says it is important for story purposes and he will introduce it in season 2. The game right now is almost finished with season 1. But yeah I would highly recommend it to anyone that likes koikatsu and story driven games, even with no sex or nudity. The story is that good.
Those two and Hero Harem Guild, as far as story goes, are in my top 10 koikatsu games, with least amount of fuckfest.
I love me both fuck fest games for days im in a hurry, and story games for entertainment purposes.
