瘦弱的高中一年級學生—小早川瀨那，因時常跑腿而有驚人的速度。因此被泥門惡魔蝙蝠隊隊長—蛭魔強迫拉攏入隊充當著神秘的光速蒙面俠21。加入泥門高中的美式足球社後，目標與泥門惡魔蝙蝠隊的隊友們一起打入「聖誕節大賽」。
Min joong and Ga hee are a campus couple and friends of Geun tae. Gentai has a crush on Jiaxi, asking her out to dinner and telling her how he feels about her. Ga hee knew his feelings, but she told him that she had fallen in love with Min joong and did not acknowledge his feelings for her. Gentai was dissatisfied with Minzhong's treatment of Jiaxi and felt sorry for her. Therefore, Genta came up with a plan to break them up by introducing a girl named Abbott to them...
