Ryosuke Kaga makes no attempt at hiding his eroticism talking about girls' breast openly in public with no exception to his classmates and friends. One day when Ryosuke is walking he finds a beautiful girl outside his home drenched in rain and openly offers her in to take off her clothes and change into some dry clothes. Amused she agrees and reveals to Ryosuke that she is actually a Death God that has been looking for him in order to make a spiritual contract that allows her to stay in the human realm until she can find a "Singular Man" who holds the power to change the world. If Ryosuke refuses to help her she will not help save his life when his time of death draws near. The one thing that girl Lisara doesn't realize is that Ryosuke's main source of spiritual energy comes from him being sexually aroused.