Good Loser Kumagawa takes place two months before Kumagawa transfers to Hakoniwa Academy, and details his time at Suisou Academy. This is the story of Kumagawa's one month-long battle with Saki Sukinasaki, a battle that ended with the closure of Suisou Academy and no winner.

Note: Parts two and three of the "Good Loser Kumagawa" series.