Kadokawa

Yuuya has always been a loser, and after the death of his grandpa (the only person he had in his corner), he's sure there's no point even trying anymore. But when Yuuya moves into his late gramp's home, he inherits... a two-way door to another world?! Access to this new realm might be just the cheat Yuuya needs to succeed in his everyday life!

A chance to come back!

Á 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...