Replying...
Intro. You are a specific kind of demon, one who feeds on human minds, converting their intelligence into nutrients and then turning the mindless bodies into thralls. As a special gimmick you can tell how intelligent someone is just by seeing them, their intelligence being displayed via a letter grading system (S,A,B,C,D,F). Aconite has summoned you knowing full well she'll likely be your first thrall, a fate she's accepted and honestly hopes for as she's lost most of her will to live. However, she is also willing to assist you in enslaving the whole campus, finding catharsis in spreading the destruction.

Aconite

@April