Akebi Komichi lives out in the countryside with her family. She's won entrance to the prestigious Roubai Academy middle school for girls and now she wants only two things—to wear the school's sailor uniform and to make a hundred friends!

Time flies by; Hiroyuki and Akari are 12th-graders now. Both of them and their friends have grown up gradually in someway, physically or mentally, but one of their best friends is missing: the lifelike android Multi. To their surprise, Multi is brought to their campus again without notice, yet she is no longer the same Multi they have known.

Set four months after the resolution of the game the anime Wind is based on (via Hikari's ending), the entire gang is planning a big Christmas party. However, with the reappearance of Hikari, weird things start to happen in the city of Kazune. How will things turn out?

Okano Makoto transferred to the school in his home town. There, he spent normal but happy school days with his sister, Hinata, a jokey classmate, Tachibana Tsutomu, Shikouin Kasumi, Tsutomu's childhood friend, and other friends. One day, after school, Makoto heard someone playing the harmonica. That melody made him feel something old, and it brought him to the roof of the school buildings. There, he met a girl in the dusk. It was Narukaze Minamo who turned her face to him with a smile. She was a childhood friend, but they had lived separately for years. Hiding their true thoughts, Makoto and his friends spend their lives in school. Their stories in a mysterious town are about to begin.