Koutarou Ijuuin

A beautiful-looking youth who just transferred to Youkai Academy. He has the ability to use his voice to charm people and make them do what he wants them to do, even though the victims are unwilling to.

[Spoiler] He is actually Nazo Koumori, the narrator bat in disguise. [/Spoiler]

The girl that he fell in love is Meimi Akashiya, Moka's twin sister