Kimi wa Beta

Synopsis

Asahi (Beta) and Seiya (Alpha) are childhood friends who grew up together. The spring they began high school, their parents decide to marry each other. Although, Asahi is surprised, he begins to accept being by Seiya's side as a family member. However, one day he ends up spraying on himself a fragrance that contains the smell of Omega pheromones...!? (Source: MU)