Gaikotsu Kishi-sama Tadaima Isekai e Odekakechuu

From Seven Seas:
One day Arc wakes up in the world of his favorite MMORPG and discovers that he’s become exactly like his game character, a heroic knight who just so happens to be a skeleton! The whole skull-for-a-head thing is maybe going to be a problem. Arc resolves to keep a low profile, lest anyone mistake him for a monster, but he can’t quite manage to turn a blind eye to the troubles of his new world. Adventure awaits, and the Skeleton Knight will be there to meet it.

Official Japanese