Before the summer tournament, a joint practice game with a strong school starts. The main character, Karin Kiritani, finds her rival, Mirei Hiiragi! Karin is confronted with the abilities of the other players, but she does her best to stand up to her rivals. Will the Hoshizakura High School led by Karin be able to win? This volume is a new edition of the previously released "Karin's Mound Volume 2" with a new side story.