Mahiro is suddenly dumped by the man she loves. Unable to accept her breakup, he breaks into her ex-boyfriend's house one day using his girlfriend's key. As she hid in the closet and observed her ex-boyfriend's life, she felt an intense rush of ecstasy. Since then, Mahiro's behavior has become more radical. She unilaterally had sex with her ex-boyfriend who had fallen asleep after lacing him with drugs. The whole story of a crazy love affair where markings are repeated with tide and saliva.