Yuukyuu Kumikyoku All Star Project

Yuukyuu Kumikyoku (Eternal Suite) is the final title in the Yuukyuu Gensoukyoku series, and is once again a traditional Japanese adventure game. The story takes place in an alternate continuity where the characters from the previous games are all students at the same school. The player chooses a character from the series history, and then must become friends with another character while also keeping on top of their studies.

[from MobyGames]