Momoko's teacher asks the third grade to draw a picture based on their favorite song, to enter in a contest. She picks a song she's recently become fond of during music class, and is anxious to make a good drawing based on it. On her way to meet relatives in Shizuoka, Momoko meets Shoko Kimura, a university student who occasionally draws portraits and plans to participate in an art contest. Momoko and Shoko become close friends, and end up inspiring each other both in their own ways.

秋季運動會即將來臨，大野和杉山負責帶領他們的白組進行訓練。怎料過程中兩人的兄弟情陷入危機。大野同學更要跟隨家人離開清水市，小丸子擔心大野和杉山這對好兄弟的友情難以修復。