That is unfortunate, I was really hoping to continue this storyline from the first game. It was a hilarious twist one of the events you can play out is Kozue and her dad. There's some great lines in the first one.
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Followed by
Eventually there's a part where you can talk to a prostitute in the street and join her on one of her tricks. You end up in a hotel room with her and two other guys. The guy who is doing Kozue says...
Man: Oh my god you feel great, This is like doing my own daughter. What would your dad think if he knew you were doing this.
Kozue: (except, I already had sex with dad, and now I'm here getting plowed by another middle age man. Oh god does that mean I have a daddy complex? That is a revelation I did not need right now...)
Kozue: Ohhhh ahhhh... mmhmmm... ahhhh...
I ended the first game with them all pregnant.
Sayuri by the Student Council VP
Mui by her own shadow right in the beginning
Hina by the Guidance Councilor
Kozue by her father (wanted to try the brother route but that was broken in the version I played)