後悔だらけの高校生活を過ごした大学生の蝶野。無為に日々を過ごす中、不思議な本と出合う。それは夢の中でリアルな高校生活に戻れるもので…。蝶野と少女たちの青春を取り戻す夢が始まる!『ド級編隊エグゼロス』のきただりょうま先生が放つ、やり直し系ラブコメ! Even in university, Chono is stuck in the past regrets of his high school years. His dull days come to an abrupt end when he comes across a mysterious book… A book that allows him to return and re-do his high school life in his dreams. Follow Chono and the girls of his dreams as they reshape their wasted youths!