With their father away on business, Koyoi is thrilled to have some brother-sister bonding time. Yoshihiko helps squash drama between Misaki and Yuuji.

Meguru refuses to join the swim team, self-conscious of the attention her breasts attract. Meanwhile, Hiroyuki realizes his love for Nao Chikura.

Haruto Terai begins to feel unwanted because Rika is fiercly independent. Realizing how he feels, she seeks to reconcile the situation.

As Valentine's Day approaches, each character attempts to win the heart of the one they love, with varied results.

Frustrated, Mamoru, Hiroyuki, and Etsu make a plan to run away. Hearing about it, the girls get more and more worried.

The boys finally get the courage to shout out their feelings, and fate has an interesting trick up its sleeve.