宮守 睦月

"After all, it's very pretty, that's why."

A friendly and pretty second-year student in the Lady Training Department. She is named the "Diva of Ginran" due to her singing ability, very talented to the point that Nina, who is a former diva, gives her approval. However, frankly, she does not seem to accept it. Her private life is full of mysteries and she seems to have a certain big secret.

It is revealed later in the story that Mutsuki is actually a boy, who has been cross-dressing since an early age due to family circumstances, but he fully accepted it. He is also Hinata's first crush and childhood friend.