So, looking at this for the first time, and the game starts out with a prologue that suggests this'll be an adventure/action/thriller-type story. Then the game proper begins and everything slows waaay down with an MC who's afraid to talk to girls and has no idea how to behave around women, and slow and innnocent fumbling first relationship-type story telling.
The MC has no business teaching a class, letting the students run all over him from the first lesson onwards, he gets flustered just talking to a (moderately) pretty girl, and it ruins his day if he sees a girl talking to another guy.
So um, does this pick up the pace a bit later on? I've played up to the arrival of the sister, is it worth sticking with if I didn't mind the prologue but found everything since then to be a slog?
(Obviously no judgement if you really like the game. People can enjoy different things.)