An extraterrestrial life form, biocraft, and humankind have a symbiotic relationship. It seems that Tise's youngest sister, Tio, is set up for "bio partner hunting." However, behind that is a conspiracy by a mysterious organization ...! ?? In addition, the mystery of why Tio's bio partner Sakurako Aise runs abusive will be gradually revealed. Is it possible to open the door of the heart closed by the vast Sakurako?