In a society where individuals are divided into 'normal' humans and 'beasts' with unique traits, Akira Miyaji, a beast doctor who defies his instincts, finds himself entangled with Kijima, a hospital director with overpowering pheromones. Despite their contrasting personalities, Miyaji is drawn to Kijima's alluring aura. When Miyaji is unexpectedly affected by Kijima's pheromones, it sets off a chain of events, including an irregular heat, that challenges their boundaries and desires.