An alpha named Fujita Tatsuya was born into a family of betas. Despite his secondary gender, he has always rejected his own nature and eventually grew into a freeloader whose only skills are housework and sex. After growing tired of his overly possessive owner, he takes a paid clinical trial job at Tenkadai Pharmaceuticals to earn some quick cash. The trial is for a drug intended for alphas. During the procedure, he is exposed to an overwhelming omega pheromone that triggers a powerful, instinctual reaction, leaving him disoriented and confused.

On his way home while still suffering from the aftermath of the trial, Tatsuya stumbles upon a man in a back alley. The man is the famous alpha president of Tenkadai Pharmaceuticals, Tenkadai Masakomi, but he is clearly in heat. To make the situation even more inexplicable, the president is emitting the exact same omega scent Tatsuya encountered during the clinical trial.