Smith breaks up a fight the monster girls are having over Kimihito, when she accidentally shoots him with tranquilizer darts. When he awakens, she tells him that there may be some changes to the Interspecies Exchange Bill, specifically, that he will marry one of the monster girls.
That news — plus the full moon that very night — makes the girls extra aggressive in expressing their love toward Kimihito. By the end of the episode, Kimihito says he will begin dating each one, seriously considering one to marry.
There's no way I would stay in that house during a full moon. I'm not gonna lie: it's exciting to imagine three females fighting over you — ripping off each others clothes and stuff — but not if you get injured in the process. These monster girls are monstrously strong, and a full moon seems to make the go berserk.
If you'd stick around, you're a masochist.
I think Kimihito will end up marrying them all. Something tells me there's a provision in that bill that allows polygamy. Am I jealous? Nope!