カテキョ! 4 [Katekyo! 4]

While living together with Kaede, Rintaro decides to start a part-time job as a private teacher. But he's met with objections from Kaede and in order to ascertain how suitable he is, it's decided that he'll teach Kaede's little brother, Tsubaki! Rintaro suddenly starts going to Kaede's family house, but what will happen... ?! It's the final conclusion to Yuu Moegi's four-part romance of two lovers trying to learn from one another as they encounter different obstacles in their relationship.