The big sister of the group. Wears bandages in a fashionable way. She controls the bandages freely, using them to attack and dress wounds. She carries a giant injection needle which contains a healing liquid. The group is very close to her and calls her "Mami-nee".
In her younger days while she was escaping from her pursuers she came across James in lab. She helped the depressed thn nameless James find a purpose in life and the two developed a strong relationship.
The four have been together since young and there was an event where Mamii saved Aki by giving her left eye in place of Aki's soul. but by the end of "first stage" she is seen to have recovered that eye.