Gakuto!

Misuzaku School hosts over 100,000 students. As discipline committee goes on rampage, main character suggests a new set of rules, but to enforce them he needs to win school elections. There are a lot of candidates to compete with - like a hentai girl who wants to change school uniform into swimsuits or a martial artist girl who wants to turn school into fighting grounds. But the root of evil is discipline committee chairman who is trying to turn the school into his own harem. To win the elections protagonist must get the buttons that all candidates have. A new school life of love, battle and conspiracy begins!

[From vndbreview]