The words "Level 0" appeared before my eyes as a dull high school student. Seeing a girl's panties right in front of me caused my level to fluctuate! Could it be... that sexual experience leveled me up?! Furthermore, a string of lucky perverted encounters has made my skills steadily rise! Now, the girls in my class who used to think I was gross are all over me! I can do it! I can do it all I want! What's this? All I know is that I'm invincible now! I've risen to the top of the class. Losing my virginity → raw sex → creampie → harem orgy! In a short space of time, my sex skills have skyrocketed to cheat-level levels, and I'm unrivaled! My stamina and erotic techniques far surpass those of the most popular guys at school, and now women are flocking to me with zero effort! If I level up any more...