Our Neighbor, Miss Yae

Keitaro (Obinata Den) is a law student and Yaeko (Aizome Yumeko) is a high school girl. They are neighbors, and their friendship is starting to develop into something more romantic. Then, Yaeko's sister Kyouko (Okada Yoshiko) has a breakup with her husband and returns home. Kyouko is clearly interested in Keitaro and Yae becomes anxious.