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初恋限定。
Ayumi and her friends are all just entering the eighth grade, as, one by one, they discover that love is infectious and you can catch it from anyone! Now Ayumi's torn between two brothers, Koyoi has an altogether different kind of brother issue and budding theatrical impresario Sumire seems ready to do anything to land her leading man. Then there's tom-boy Rika, aspiring artist Nao, Kei, who's very 'mature' for her age and older girl Misaki who really IS more mature.
When the wrong boy professes his love for Ayumi, she struggles to find an appropriate way to reject him.
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.
Preparations for the school sports tournament are underway, and everyone is on edge. Despite the agitation, there's a chance for sparks to fly between Kei Enomoto and Etsu Kusuda.
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.
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.
Nao is determined to finish up her painting of the graduating class. As she works she is left heartbroken as someone she cares about leaves.
Sumire uses somewhat questionable tactics to get Etsu to join the theater club, which makes him a little angry.
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.
