/ Anime & Comics / Servant Summoning System in One Piece
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"Servant Assassin has been summoned. I ask of you. Are you my master?"
"Yup. I'm Gol D. Sou, nice to meet you!"
In which a teen assassin who isn't quite right in the head is reincarnated as the oldest child of Gol D. Roger and decides to live a free life along with his Servants from the Fate franchise.
Author ImProcrastinating