When Tsuyoshi rushed to school as usual, he found a girl who tried to help a kitten which couldn’t get down from a tree. It was Minamizato Ai who had loved Tsuyoshi secretly for a long time.

Many people have fond memories of meeting a certain teenage boy in their younger years. However, their ages vary widely, and each remembers him as a teen. This story follows the intricate intertwining of their various stories and how this young man, who apparently lives outside of time, has affected each of them.