A tentacle-like symbiote falls into the hands of Itsuki, an older student who uses it to have fun with her younger lover, Hiyori. The pair are secretly observed by another student named Rena, who decides to take control of the symbiote and use it for her own purposes and personal gain. Rena sets her sights on her first target, Touka, a girl who treats her younger pupils with contempt. The symbiote inhabits the bodies of the girls, forcing them to attack other young women in a school setting. The narrative follows the transfer of this parasitic entity as Rena manipulates events to her advantage, leading to a cycle of domination and surrender among the female cast. The single episode OVA is based on a visual novel by WendyBell.