Sōra is a 2nd-grade high school student, but he is virtually invisible at school. He is friends with Chūya. Chūya's personality is completely different from Sōra. Chūya does unpredictable things and that surprises those around him. Sōra and Chūya both have feelings for the same girl at their school. The girl refuses to attend school, because she doesn't want to change her brown hair to black. Their school has unreasonable rules, including requiring all students to have black hair. For the girl that Sōra and Chūya like, they stand up to change their school's black school rules.

高中生创乐和中弥过着黯淡的青春时光。在他们的学校里蔓延着不讲理的规则：“黑色校规”。某一天，他们喜欢的女孩因被强制要求把与生俱来的美丽褐色头发染成黑色而拒绝来上学。“真是受够了这种规则”。黑色校规究竟能否改变呢？创乐和中弥将卷起一场异想天开的战斗。

Sōra is een middelbare scholier uit de tweede klas, maar hij is vrijwel onzichtbaar op school. Hij is bevriend met Chūya. Chūya's persoonlijkheid is compleet anders dan die van Sōra. Chūya doet onvoorspelbare dingen en dat verrast de mensen om hem heen. Sōra en Chūya hebben allebei gevoelens voor hetzelfde meisje op hun school. Het meisje weigert naar school te gaan, omdat ze haar bruine haar niet in zwart wil verven. Hun school heeft onredelijke regels, waaronder de eis dat alle leerlingen zwart haar moeten hebben. Voor het meisje dat Sōra en Chūya leuk vinden, komen ze op om de zwarte schoolregels van hun school te veranderen.

僕らは戦う。何と。ブラックな校則と。恋するあの子を救うために！本当の自由を手に入れるために！2人の男子高校生コンビがブラック校則に縛られていたひとりの女子生徒と、やがては全校生徒の心をも解放するべく、奇想天外、ユニークな方法でブラック校則と戦う！

교칙에 의해 학생의 머리 모양, 복장, 행동 등을 엄격히 제한하는 한 고등학교. 무개성 집단 속에서도 한층 더 눈에 띄지 않는 존재인 고교 2학년 오노다 소라는 학급 가장 밑바닥에서 최저의 청춘을 보내는 중. 한편, 소라의 친한 친구 츠키오카 츄야는 분위기를 읽지 않는 타입으로, 언제나 예측 불가능한 행동으로 주위를 놀라게 한다. 그런 정반대의 두 사람이 태어날 때부터 아름다운 갈색 머리였던, 염색을 강제하는 규범에 반발하여 등교 거부를 하는 여자를 좋아하게 된다. 두 사람은 그녀를 위해 블랙교칙에 맞서기로 결의한다...