Mamoru is in love with the girl next door, but she sees him as nothing more than a childhood friend. Meanwhile, Ayumi is head over heels for Mamoru.

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.

Preparation for a Christmas party leads to an embarrassing moment, causing Kei to treat Etsu harshly.

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

Sumire uses somewhat questionable tactics to get Etsu to join the theater club, which makes him a little angry.