天才少女夏瞳患有一種「不思考就會急速衰老而死」的絕症，為了活下去，她唯有一直讓大腦保持高速運轉的狀態，不斷地解決各種謎題，以延緩衰老的症狀。理科成績全校第一的李伽略是夏瞳的同班同學，在知曉夏瞳的秘密後，毅然決定幫助夏瞳，為其搜尋發生在身邊的各類不可思議謎團。從此，高冷美少女與呆萌學霸男的解謎組合正式成立，他們將應對一系列匪夷所思的事件，包括「憑空消失」、「電梯肢解」、「漂浮的屍體」、「密室殺人」、「腳踩胡蘿蔔的少女」等。而有著超人推理能力和洞察力的夏瞳，又能否破解李伽略十歲那年其雙親在膠帶密室中被殺的懸案呢？
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