Makoto Konno, a pretty and precocious high-schooler, has two guy best friends in her class. One of them is her childhood friend Kosuke Tsuda and the other is Chiaki Mamiya. After school, Makoto would much rather play baseball with her guy friends than hang out with the girls from her class. It isn't like Makoto is dating either boy; the three of them share a casual and easygoing friendship. Makoto values their kind and innocent bond, especially since they are all about to become high school seniors and will have to make serious decisions about their lives. But change is about to come for Makoto, sooner than she thinks... After a mysterious incident in the school chemistry lab, Makoto finds herself with the gift to slip back into time. Makoto can retrace her steps to yesterday, or last week -and she can change things at will. She can choose to re-indulge in a great meal, or fix an annoying problem with one little tweak of the past. But once Makoto gets a handle on her ability, she finds herself consumed with her new power. Is she putting her friendships with Kosuke and Chiaki at risk? Can their fragile bond survive Makoto's leaping through time?