Good Loser Kumagawa (グッドルーザー球磨川, Guddo Rūzā Kumagawa) is a special chapter of the series Medaka Box. It appeared in Shueisha's Jump Next, and featured Misogi Kumagawa as the main character. The chapter was later included in Volume Fifteen. It is the first part of the sub-series, Good Loser Kumagawa Gaiden.