Medaka Ikeya is a junior high school student who aims to play in the major leagues.
A pitcher with a promising future.
However, in exchange for a shutout in the final game of the prefectural tournament, she sustains a serious injury that will prevent her from pitching for the rest of her life.

Misaki, a girl in a wheelchair, appears before Medaka, who is sinking in despair.
To encourage her, he recklessly challenges her to run a full marathon!!

And from here, a new talent outside of baseball begins to bloom...!!