Become Konoha's Naruto and Receive a Letter from the Future

A young man traveled to the world of pirates and became the three-year-old Uzumaki Naruto. What's going on? When he was confused, the system was bound. "The space-time letter system has been successfully bound!" Naruto could ask his future self to write to him. After learning the shortcut to success through a letter, Naruto embarked on the path to genius. Three-year-old Naruto: Learn basic ninjutsu! Five-year-old Naruto: Attack the Chuunin! Ten-year-old Naruto: Even Kakashi can't beat me! Fifteen-year-old Naruto: So boring, why do you want to be Hokage? Hinata Hinata: Husband, you are so outstanding! This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.