Twins Kazuya and Tatsuya, along with their neighbor Minami, have played together since childhood, forming an unbreakable bond. However, as they hit puberty, the twins come to a realization: Minami is a girl, and three is a crowd. As the trio attempts to maintain their relationship, Kazuya's promise to make Minami's dream come true by taking her to Koshien with his baseball pitching skills causes the laid-back Tatsuya to reflect on himself and his own aspirations. Yet, Minami has another dream she wishes to fulfill, and as the twins continue to push their limits with Minami caught in the middle, a life-altering tragedy leads one twin down a path he never would have considered before...
