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?

[Source: AniDB]

Kazenone City, it is a city that made people feel nostalgic and wonder.
It was also the home country of Okano Makoto and his little sister, Hinata. They came back this town in order to look for their mother who had disappeared suddenly. Their friends and childhood friends welcomed their return. Makoto began to notice something important through the encounter with them. With the tone of a harmonica, and with their thoughts in their hearts, the fantastic tale began in this mysterious town.

[Source: AnimeNfo]

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.

[Source: AniDB]

Four 13 minute episodes that came with the DVDs. Episodes 9.5, 10.4, 10.8 and 12.5.