影片故事设定在光津高中，学生们留着同样的发型，穿着同样的制服，背着一样的书包，穿着一样的鞋子，毫无个性可言，甚至连行动都被严格的“黑色校规”控制，而在这一群无个性学生中还是有独特的存在，高中二年级学生小野田创乐生活在班级最底层，过着最糟糕的青春，他的同班好友月冈中弥与他完全不同，特立独行，两个人关注着同一个女生，她不服学校规定，染了栗色头发，创乐偷偷喜欢着拥有美丽栗色头发的她，为了这个女生，创乐和中弥决定打破校规。

小野田創樂（佐藤勝利 飾）就讀嚴格控管學生髮型、服裝以及行動的光津高校，某天早上，他突然對同學町田希央一見鍾情。然而，天生擁有一頭美麗動人栗色秀髮的希央，為了不被學校強制染成黑髮而拒絕上學，瀕臨被退學的危機。為了找回希央和學生們的青春，創樂與同班的摯友月岡中彌（高橋海人 飾），決定採取行動打破這「黑色校規」……

Sōra is a high school student who is basically invisible at school. He is friends with Chūya, who is an unpredictable character that often surprises those around him. Sōra and Chūya both have feelings for the same classmate, Kio Machida. The Machida girl refuses to come to class, because she doesn't want to dye her naturally brown hair black. Their school has unreasonable school rules, especially about uniforms, which include requiring all students to have black hair. Sōra and Chūya decide to stand up to change their school's black school rules so that Machida won’t have to repeat a year of school from missing too many classes.