Habaki, a police officer, and En, a writer, grew up as childhood companions in an orphanage. Unfortunately, En's abnormally intense pheromone secretion causes him to be sensitive to both his partner and others, and to make matters worse, he has a genetic mutation that renders traditional control measures ineffective.
Although Habaki is unaware, he dedicates himself to supporting En's well-being at the expense of his own career prospects. However, upon starting work at a new jurisdiction, he uncovers a distressing case involving an omega rape.
Despite his partner's intense pheromone levels during his estrus cycle, En reaches out to Habaki as if he were an omega himself.