The Boy Who Ruled the Monsters: Before I Knew It, the Ultimate Specialized Support Skill Led to the World's Ultimate Party! manga volume 1 features story by Sin Guilty and art by ketsuyuki tamon.

Black Tiger was a party of five up-and-coming prodigy adventurers known as the Miracle Children. Among these big names, Sol was the black sheep - mocked for being useless, treated like a grunt, and eventually kicked out. But the truth is, he has a rare and powerful talent - “Player!” This godlike talent allows him to buff his allies and control the flow of battle. To achieve his dream of conquering every dungeon, he starts gathering new companions to create the ultimate party… and ends up summoning a dragon?!