One piece : The God System

This is a story where a suicidal maniac tries to kill himself by jumping from a building while cursing God . After what seems like an eternity he wakes up finding himself in front
of an old man that sympathize with him and grants him a choice either to sleep forever or to be reincarnated in his favorite world " One Piece" but as a mission from God and by the end , God will judge how well he did but the catch is that he will forget this conversation. And the MC agrees directly.
This is typical reincarnation with a system.
DISCAIMER: i do not own one piece