Kotaro Yuki is a 26-year-old man. When he was a child, he played baseball with fierce determination. Since then, he hasn't given his best to anything else. After he quit his job, he just spends his days meaninglessly. He lives in a house that his parents left behind. One day, a mysterious man appears in front of Kotaro Yuki. The man introduces himself as Kotaro Yuki's former pet dog Ten. When Kotaro
