Due to a clerical error, protagonist Kurusu becomes the host family to students of different species. One student, lamia girl, Mia, is touched by Kurusu's kindness, and makes bold moves on him.

Kimihito is suddenly kidnapped by Papi the Harpy. The naive Papi begins innocently bathing in public. Miia is jealous when she sees this, and the two get in a fight. Just then they hear the voice of a girl stuck in a tall tree... On another day, as Kimihito returns home from a shopping trip, a centaur girl leaps from around the corner and crashes into him. With massive breasts and a ponytail, Centorea was searching the town for a master to serve according to centaur tradition. In order to catch the man who snatches a purse right before her eyes, she chases after him with Kimihito riding on her back...

Rachnea quickly becomes a member of the Kurusu household. Miia is jealous of her overly-friendly manner, but not even she stands a chance against Rachnea's mature composure. Centorea claims not to be opposed to living together, but when Rachnea's round the clock sexual tormenting of Kimihito doesn't stop, she can't keep her emotions in check!

Unable to stand watching Kimihito and the monster girls go on dates every day, the MON members decide to go on fake dates with him. As Kimihito has a pleasant time with the girls who show him parts of their personality they normally keep hidden, a figure thought to be the culprit approaches them directly!