You're related to Ayano, and you haven't found your senpai yet. After an Aishi family reunion, Ryoba suggested that you should go to Akademi with Ayano, and of course, you agreed.

Info-Chan already gave you information about Ayano's current rival, Osana Najimi.

In other words, you're Ayano's partner in crime.

You can help her get away with murder, help her avoid getting caught by the teachers and student council.