Navigation: Traveling as Luffy and Receiving a Letter from the Future

A young man traveled to the world of pirates and became a three-year-old Luffy. What's going on? When he was confused, the system was bound. "The space-time letter system has been successfully bound!" Luffy can ask his future self to write to him. Future Luffy immediately writes a letter to his past self! 7-Year-old Luffy: Completed the Sixth Marine Style! 12-Year-old Luffy: Accomplished armed color and domineering! 15-Year-old Luffy: I'm going to sea and I'm becoming the emperor? Going to sea is the fifth emperor! One Piece doesn't just have to have hands! This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.