During a rooftop battle with a rival school student, Mikami Inaba faces a critical moment when her friend Haru intervenes. In the chaos, a mishap with nearby rabbit cages leads to a dangerous fall. Desperately clutching onto a rabbit mid-air, Mikami is engulfed by a pink light, merging with the small creature to embody a new persona named Mimika. From that point on, Mikami switches between her original self and Mimika when danger looms over her or her friends, navigating a dual existence to protect those dear to her.