平静略显无聊的日子里，枣恭介（绿川光 配音）、枣铃（民安智惠 配音）、井之原真人（神奈延年 配音）、宫泽谦吾（织田优成 配音）以及直枝理树（堀江由衣 配音）等Little Busters的各位坐在一起聊天。真人讨厌被大家成为宇宙笨蛋，恭介则适时提出了强者挑战赛，拿到冠军自然有机会为自己正名，此外他还为在场的各位设定了种子排位。在此之后，接二连三有趣搞怪的挑战赛在校园内举行。与此同时，来谷唯湖（田中凉子 配音）则帮助西园美鱼（巽悠衣子 配音）、神北小毬（柳濑夏美 配音）、能美?科多缭卡（若林直美 配音）等人解决各种各样的人生难题，反倒闹出不少笑话。 谁知就在此时，一个神秘的面具齐藤接连打败排行榜上的高手……
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