"I don't want for someone who meets me for the first time to do this." Uiko is an omega who is working at a company while posing as a beta. She has to do this in order to protect herself from approaching alphas whose pheromones could start her estrous cycle (heat). When she suddenly enters her heat and her pheromones can no longer be suppressed, she rushes to the matching salon "AΩ". At this place dedicated exclusively to Alphas and Omegas, Omegas can safely get over their estrous cycle. Simply put, it's a "sex salon". And that's where she meets the mysterious Alpha whose face is hidden behind a mask. "Even though I met him for the first time, he smelled sweet and I melted just as my body was deeply drawn to his... I want this person deeper into my body! What is this feeling I can't seem to control even though it's my first time?"