Having miraculously landed a study-abroad position, Keitaro bids farewell to the girls of Hinata House, just as things between him and Naru are beginning to heat up. A chance flight delay offers Naru enough time to get all the bottled up emotions she's never been able to properly express off her chest.
Time passes and a new face proclaiming to be the new Hinata House landlord shows up on the girls' doorstep. This girl is none other than Keitaro's own little sister, Kanako Urasima. As resentments flair between the residents and Kanako, several feuds erupt that-if not tactfully resolved- could very well rip the close knit family apart. And what's this about the girls' dormitory being turned back into an inn?