Omiya Yoko, whose nickname is Akko, is the manager of Yoshikan High School’s baseball club. All she thinks of is the baseball club when she is asleep and awake. In her second year of high school, she is diagnosed with asopharyngeal cancer. This life-threatening illness comes as a shock to her, but the sight of her fellow members practicing for the Koshien makes her vow to persevere in her medical treatment and come back healthy. The baseball team also promises Akko that they will bring her to the Koshien. The treatment ends and Akko returns to the baseball club to the delight of her friends. She joins a school trip and embraces student life. However, it is shortlived. Discovering that the cancer has spread in a short time, Akko finds herself staring death in the face. She continues treatment, but when she learns that she will also spend the next summer at the hospital, she makes a decision... ~~ Adapted from the book "Akko to Bokura ga Ikita Natsu" by Arimura Chihiro.