Taro Yamada gave up on baseball and enrolls in a high school with no baseball team. But that's where he finds the strongest battery, Haruka Kiyomine and Kei Kaname. Why would they be here? Besides, Kei has amnesia and forgot about baseball.

Out of curiosity, the team attempts different methods to try and get Kei's memory to come back, but not a single one seems to work. However, the next day...