Seven years ago, Mifuyu fought as Yachiyo’s partner.

Spoiler

After noticing her magic was weakening and falling into despair, she joined the Wings of Magius as a second-in-command. In this role, Mifuyu recruits and guides the Black and White Feathers. She protects them when necessary. Despite her guilt, she stays with the Magius for this responsibility and hopes to save herself and Yachiyo.

Mifuyu is considered "sisterly" by younger magical girls. This stems from her status as a veteran. She struggles with chores and is often taken care of by her friends. Though kind and gentle, her spirit is weak, which leads her to sometimes make bad decisions.