Kazuhito has been called a "failure of an omega" who still hasn't had his first heat at 20 years of age. One day, he's suddenly kicked out of his home, and as he's about to be forced into a marriage of convenience, he barely escapes by a hair's breadth, but ends up in an even worse situation. In the middle of running away without food or water, he ends up collapsing in front of an inn, where he's saved by the innkeeper, Hiroumi. After Kazuhito explains his situation, Hiroumi tells him that he needs Kazuhito at this inn! Hiroumi reveals that he has a constitution of releasing pheromones that attract both omegas and betas. Kazuhito appears to be the first omega unaffected by Hiroumi's pheromones, thus Kazuhito's urgency to recruit him to work at the inn. Kazuhito feels elated at being needed for the first time in his life, but he learns that this "Aonishi Mewoto Inn" is known as the "Fertile Hot Springs", where omegas can relax to the point of inducing their heat...!

*Mewoto is derived from "meoto", meaning a married couple.