The protagonist, Sota, lives in a share house with housemates who are, unbelievably, three succubus sisters!

The pampering older sister, Misa. The cool and taciturn second sister, Rin. The youngest sister with a masochistic streak, Mei.

Sota, as the food provider (!?), has his energy drained by the three of them every day, but during Golden Week, Misa and Mei go on a trip, leaving him alone with Rin.

Rin, who has secretly been interested in Sota for a while, invites him to have sex out of curiosity. Unable to refuse the advances of the attractive Rin, their excessive, non-stop holiday begins...!

And on the final day of Golden Week, Misa and Mei return home and join in, escalating into an even bigger orgy!