Only I can “level up”!? Become stronger by “union” with a beautiful girl! Best partner fantasy! Everyone is gifted with a talent at the age of 15 - "Skill". Chamber was a member of "Dawn", a party that was prominent in the city, although it was made up of only young members. After acquiring a mysterious skill with an unclear "level up" effect, he is expelled from "Dawn"...! Although he was abandoned by other members who gained powerful skills, Chamber continues to work as a solo adventurer. In the midst of all this, he learns the true value of the skill ``Level Up''". The more enemies you defeat, the more you level up and become stronger..." Chamber realized that his own skill was not a "useless skill", he also has a fateful encounter with a certain girl, and ends up spending his days pursuing strength...! Missing skill x Missing skill = Strongest!Best partner fantasy by exiled people!