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During one of his visits to a gay bar, Yamato, a refined top with a princely aura, chanced upon a porn video featuring Jin, a top with a wild character. After hearing rave reviews about the man's wondrous sex, Yamato's curiosity piques as a fellow top. Promptly, he goes to visit Jin and seeks out the man's expertise. But Jin's condition is to teach through practice, and that's where our story begins!

Getting all his levels and first time stolen by an undefeated, cheat-skill-using new adventurer?! Dive into a world where everyone has a special skill. Shu uses his Level 999 ability to save a newly reincarnated salaryman from a magical beast. After returning home and chatting over drinks, the salaryman's skill is revealed—he's a strong, top-tier adventurer with an incredible ability! But the way to activate his skill is only by…?! "Why don't we level up in bed…?"

At his favorite gay bar, Yamato is shown by Takane a gonzo video on social media. The wild top in the video, a guy called Jin, is highly praised by Takane and Yamato, who is known in the area as a handsome prince-like top, is naturally interested in him. Yamato easily spots him in the bar-restaurant that Jin runs, and in the course of the conversation, Yamato asks him to teach the bed techniques. How does he make bottom guys so satisfied? But in order to be taught, he has to act like a bottom... and Yamato seems to be opening up his mind as well as his body. But Jin has been announcing that he sleeps with someone only once to avoid messing around. While two guys are getting closer and closer, Yamato becomes afraid of having their real first affair...