Tanaka Kichirou is an omega, who, without his prior knowledge, is set as the homeroom teacher for an all alpha high school class. Kichirou tries to get out of being the homeroom teacher, but once he finds out that one of the other teachers, Fujima Natsuki, recommended him for the position, Kichirou concedes. Not knowing what to expect, Kichirou meets sixteen year old Arimori Jun within the classroom.

Follow the ups and the downs of the lives of these alphas, betas, and omegas. Maybe, even, in the road of life, they may find that red string of fate that connects one to their mate.