Ryo and Souma are finally ready to take the next big step--moving in together! Which means they need to figure out what kind of apartment they'd like to live in. Though they each have separate needs, the process starts off smoothly, with only a few bumps along the way, like opening up about their relationship to Souma's parents. Surprisingly, the biggest hurdle is Souma's younger sister, Mei, who doesn't like Ryo at all. Can Ryo salvage their relationship--if not for her sake, for Souma's?