Good start, good models... interesting to see where it goes.
Though, I hope in later versions you expand on the premise. You're obviously basing things on the anime, but you shouldn't feel too restricted by that. For example you could give the girls "Love/Lust points" that we can earn through dialogue choices that they like, which can lead down later story paths. Perhaps through earning such things during the Yuuma date we can end up fooling around with her in the changing room (and other places), which would lead to an alternate confrontation later where she's sadder about killing us (still does obviously) and would lead to her later being captured instead of killed. Perhaps give the MC Dominant and Submissive points from dialogue too which would lead to different sex encounters, one's where it determines if he or the girl leads, if he's more or less aggressive in pursuing them, etc. Stuff like that.
Anyway, it's only at v0.1, so plenty of room to grow and I hope you keep going.