Kose is an Elemento Academy student who is first seen doing an assignment for Monsterology Professor Gretel. He had lent his crib sheet to fellow student Beourg to help him study for a test. When he receives the ruined crib sheet back, he laments having never let his crush Roselle use his crib sheet. He curses Beourg for ruining his chances with Roselle.
He was the one who spotted members of Freyjanity entering Fritz's house and reported it to Dean Wilfred.