Official English on Coolmic
Note: Coolmic has the manga version but has less content (pages in each chapter are less) compared to the original manga in Japanese.

Official English on Renta

He's the only omega in an all-alpha school. "Even if It's only a limited-time relationship, and even though I tricked you, I wanted you to be the first one to take me." Toba and Banzawa are a pair of delinquents having the time of their lives at a high school for alphas. Every day, all they do is fight with delinquents from other schools, and Banzawa is the only one who has Toba's back. But Toba has a secret he can't tell Banzawa… In reality, Toba's an omega!? While anticipating that he'll have to leave school when he goes into heat for the first time, one day he suddenly goes into heat right in front of Banzawa…!? "Have sex with me, please!" With omega pheromones in the air, Banzawa rips Toba's shirt off…!!