One Piece: Turns Out I'm the Strongest in the World

An ordinary man is chosen by a goddess from another world to become her knight and reincarnate alongside her to save the world. But when the reincarnation magic goes wrong, the man and goddess transmigrate to an unknown world: the world of One Piece.

He unexpectedly becomes an undead skeleton, with nothing left but bones and no flesh on his body.

And that's not the only thing that goes wrong. The so-called number-one support goddess of the Divine Realm also has an astonishing appetite. Whenever she gets hungry, she loses her magic and turns into a dimwitted girl. She's completely unreliable.

He could put up with all of that! But then...

How can some old man from a country village knock off two percent of his health with a single punch? This world is ridiculously overpowered!