The Master that Sails the Sea

Zelretch is bored one day and decides to mess around with a boy, Yuuki Yuuto. He has been a fan of the Fate and One Piece series since he was a kid. When he got older, he could not help but become a bit perverted of the girls in the franchises. Zelretch decides to send him to the world of One Piece while giving him books on magecraft, opening his magic circuit and magic crest, a devil fruit, and the ability to summon servants and command seals. After finding out why he is here, Yuuto decides to use this opportunity to become a magus, sail the seas of this world, and maybe start a harem here.