Rumi Usagiyama, a highly respected Pro Hero known as "Rabbit Hero: Mirko," embodies the spirit of freedom and independence. Since her appearance on the hero scene 17 years ago, she has stood as a symbol of determination and autonomy, consistently refusing to tie herself to any Hero Corporation. Over time, Rumi has undergone significant personal growth, transforming from a hot-headed and foul-mouthed Pro Hero into a more mature and level-headed individual.