Determined to shed his virgin status, Sou Kurosaki sets out to find a supernatural being to fulfill his goal. After unintentionally summoning the succubus Kogure Deimon, Sou is surprised to discover that the alluring being is actually a boy. As Kogure stays with Sou until his mission is accomplished, the two navigate a peculiar cohabitation where Kogure is resolute on achieving his objective of taking Sou's virginity, no matter the cost.