Shiki Tsubasa has just moved from Tokyo to the city of Kitami in Hokkaido. When he gets lost, a flirty gal named Fuyuki Minami points him in the right direction. After the two meet again at school, Minami invites Tsubasa to hang out with her at home.

Tsubasa decides to attend the Kitami Winter Festival with Minami. Tsubasa is nervous and wonders if it classifies as a date. Some days later, during lunch, Minami asks if she can go to Tsubasa's house. On their way there the two come upon a snow mound.

Tsubasa starts learning to ski on a class trip to the slopes. He's told to partner with Akino Sayuri, a pretty loner that Minami is fascinated with. When he runs to the bus to grab his chopsticks for lunch, he finds Akino half-naked and covered in sweat.

來到卡拉OK 的小翼同學們都為即將到來的情人節而興奮不已。不知為何，當小翼得知美波沒有特定的對象可以交給她時，她感到鬆了口氣。小百合說她對情人節沒有興趣，但後來她在遠處觀看情人節集市時遇到了美波。小百合忍不住想起小翼的臉，決定和美波一起買巧克力。小百合決定問美波一個問題。

小翼和他的朋友們在南家舉辦期末考學習會。翼全神貫注於學習，忘記了宵禁，匆匆離開冬木家，最後被汽車送回家。麻衣告訴美波她情人節的感受以及她對翼的感激之情。第二天，小翼在上學時遇到了不再是日本人的美麗女孩夏川麗奈。她似乎是美波所仰慕的前輩，在學園祭選美比賽中連續兩次獲得冠軍。當晚，麗奈出現在翼家。隨著蕾娜的出現，有種事情會變得更加動盪的感覺…

Tsubasa is ordered to score high on exams, so when the lovely Rena offers to tutor him, he accepts. He soon realizes that Rena expects a reward for her help. Minami spots them together and is thrilled at first, but then starts to feel very uncomfortable.

Minami and Sayuri race to the scene of Tsubasa and Reina's date. After being moved to tears over the movie heroine's story, Reina tells Tsubasa about her own circumstances. Tsubasa, having been reminded of his own situation, then tells her his story.

Matsuo, a class friend who made amends with Minami, takes Tsubasa smelt fishing as a thank you for his consultation. Minami, who happened to be at the fishing spot, joins them, and they discuss makeup. Later, Minami visits Tsubasa who's caught a cold.

The new term begins. Minami catches Tsubasa on the way to class and starts teasing him ruthlessly. The two are thrilled to learn they are in the same class again, but Minami still seems gloomy. After school, Minami says she has something to tell Tsubasa.

A sleep-deprived Tsubasa meets up with Minami and they head to her secret location. Later, Minami suggests they should return there years from now and Tsubasa wonders what she means by that. She then reveals what it is she wanted to convey.

Tsubasa and Minami miss the last bus home from the park and end up getting a hotel room, making the overnight date that Minami had joked about a reality. However, Minami sneaks out early, leaving Tsubasa confused and afraid to face her before she leaves.