A corrupted Rin is floating in a pool of water where she remembers the time before she was corrupted. It is revealed that Rin was the previous magical girl of the Tokyo ward before Kobarin, and in a fight against a monster, a building's debris broke off and hurt some civilians, which Rin witnessed and ran away in guilt; when Rin had retreated to a dark street alley, doubting herself as a magical girl, her now corrupted familiar Libby appeared and corrupted her power as a Magical Girl, resulting in the current corrupted Rin...