Синопсис:

Mikami Inaba was fighting a person from another school on her school's rooftop. As they fought, her friend Haru appeared. Seeing Mikami distracted, the man charged at her, causing both of them to break the nearby rabbit cages & fall off the roof. As Mikami fell, she desperately grabbed the rabbit. Suddenly, a flash of pink light appeared. Mikami fused with the rabbit, and gained another personality, called Mimika. Now, Mikami only appears when various people threaten her and her friends. Otherwise, she takes on the form of the innocent, happy-go-lucky Mimika. She gains an incredibly voluptuous body, including an unfeasibly huge bosom. The story continues with the plot of an evil organization trying to uncover the power that causes merging.

Wikipedia