Habaki (police officer) and En (writer) are a pair who grew up together in the same orphanage. En struggles with abnormal pheromone secretion: sensitive not only to his partner, but to others as well. To make things worse, En developed a genetic mutation where common suppressants are no longer effective - at least, that's how it appears.

A clueless Habaki continues to neglect his career prospects for En's well-being. On his first day as a transfer at a new jurisdiction, he begins to investigate an omega rape case. Meanwhile, producing excessive amounts of pheromones, En reaches out for Habaki as he enters his estrus cycle — almost as if he's an omega...