活潑好動的黑鐵疾風,代替受傷的雙胞姐姐成為天地學園的劍待生。原本打算在姐姐回來之前不動聲色的疾風,卻誤打誤撞地接下了800萬的欠債！為了還債,疾風必須尋找「刃友」一同藉由「奪星」來賺錢。她所找上的,是個有著神秘過去的少女．無道綾那……爆笑美少女的校園冒險,就此展開！
超巨大學校．天地學園──全是女學生的這間學園裡,有著「劍技優待生」這項制度,藉由進行稱作「奪星」的比賽,排列學生們的等級。有著隱情不得不轉學到這裡的傻大姐．黑鐵疾風,與可靠卻孤高的劍士．無道綾那結為搭檔,和接二連三出現的對手們一較長短。
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