Seisan Skill ga Kansuto shite S-kyuu Rare Item mo Tsukurerukedo Boukensha Apartment no Kanrinin wo Shite imasu

Earth, a boy who mastered every production skill by the age of 12, suddenly disappeared after presenting an artifact to the king. Five years later, Earth, unemployed and with no money to live on, finds work as the caretaker of an apartment building full of troublemakers! Earth uses his various mastered production skills to change the lives of these A-rank adventurers, who are incredibly skilled but riddled with problems as people!

https://www.cmoa.jp/title/334345/?srsltid=AfmBOopawXt0Z1gt23CtLVd3B4XiP4roca-tQFfG1nejL38MNU6XerGk