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Saya, a young girl in a wheelchair, dreams of playing baseball, her favorite game. At the medical center where she is hospitalized for treatment, she meets Akira, a high school baseball player, but she dies in a car accident on her way to observe Akira's practice. The Shinigami takes pity on Saya, who died so young, and gives her 49 days to live in exchange of his own life. Saya is brought back to life as a high school student and joins the Kikugawa West High School baseball team, aiming for the Koshien Championship with Akira and the others.

Note: The first release of this manga series contained 5 volumes in total, while the following ones had 3.