Serialized in Monthly Shonen Champion from 2013 to 2016, the original story is a coming-of-age comedy about a baseball club that depicts the funny and sad and realistic daily lives of high school baseball players. In the movie, Teppei Kuroda says goodbye to his junior high school baseball club life and enters the school with dyed brown hair to make his high school debut. Although he dreamed of a rosy high school life, he was recruited by kind seniors and inadvertently joined the baseball club. However, as soon as the period of temporary enrollment ended, the attitude of the seniors suddenly changed.