After 17 ordinary years on Earth, Macoto's journey should end with a strange chance. So, life gave him a reset button. With his new abilities to jump in time, he immediately intends to erase all small troubles from his daily life, from bad estimates to dubious relations with which he cannot cope. But as her races in time are becoming increasingly more frequent, it is forced to understand that every change she does is have deep consequences that she cannot foresee ... and if her strength will bring it, consequences can be disastrous ... as a prelude to the 2006 animation film with the same name, which, in turn, was freely based on the 1965 novel.