The mc is a virgin who wanted to have sex so bad, then someone on a net told them a sacred ritual to summon a being who will be able to fulfill his dream. In order to succeeds the ritual, the mc, Takashi, have to endure his libido for 72 days, as a normal guy, having him not to jerking off for that long ain’t easy. And finally 72 days has passed, the long awaited day is finally here. When the night falls, he began the ritual and recite the sacred spell. A sparkling light starting illuminates his room as a sexy succubus slowly ascends from the magic circle he drew. But Takashi was rather confused, because the figure he just appeared in front of him is none other than his step-mom.