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 revealedhe'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?"