Glenn is a bastard who only sleeps instead of teaching class at the Alzano Imperial Magic Academy. When one of his excellent students, Sistine, finally gets fed up, she challenges him to a duel to make him teach properly.

Even after losing the duel, Glenn lacks all motivation. Yet through his interactions with Sistine and Rumia, he eventually starts genuinely teaching classes that will help them. Meanwhile, suspicious men show up at the academy...

Preparations begin for Sistine and Leos' wedding ceremony. Rumia holds out faith that the vanished Glenn will return, but they still have no word from him by the day of the wedding.