I Got a Cheat Skill in Another World and Became Unrivaled in The Real World, Too

異世界でチート能力〈スキル〉を手にした俺は、現実世界をも無双する ～レベルアップは人生を変えた～

A mysterious door stands open, inviting a boy who's been brutally bullied all his life to take a courageous step forward into the unknown. On the other side, he finds a hoard of priceless artifacts and a world as filled with magic as it is with monsters. The most shocking revelation, however, is that he can bring whatever he wants back with him when he returns to Earth. It won't be long before this double life changes him forever... (Source: Yen Press)