.Due to certain circumstances, Mitsutani repeats an unstable heat, and each time there is a reason to look for an opponent for one night (Omega). One night, Eiji Tohsaka, who is an alpha, saved the place that was entangled in the back alley at night during estrus. Mitsutani feels a strong urge to the Eiji who creates an unprecedented intense pheromone. Even though he hides his turmoil and seduces Eiji, the in front of him is a peculiar constitution where he cannot feel the pheromone...! ? "You know you're being invited without feeling the pheromone, anyway?" After all, just one night of sex... Tomorrow's stranger. Nobody likes it anymore... I intended to... Dramatic OMEGA Birthlove led by destiny of a younger man who doesn't know love x an older who was frightened by love!