Ai is Saki's friend who is a good coordinator.

The story revolves around Yuki, a boy who wants to become friends with his classmate and desk neighbor Kaori. However, she gently declines his friendship, saying, “But, my... Memories of my friends disappear in a week...” Even so, Yuki wants to become her friend, and so the two become friends over and over again as the weeks pass.

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Yuuki Hase desperately wants to be friends with Kaori Fujimiya, the girl in class who seems to always be alone. Just when he thinks they've hit it off, she tells him her secret: Every week, her memories reset. Yuuki resolves to befriend her as many times as it takes, but is he prepared for how much it will hurt to be one-week friends...?
 
(Source: Yen Press)
 
Note: Includes the prologue and 2 extra chapters.

Specials included in the Blu-ray/DVD releases.

Ai Nishimura