Naruto: The Bondwalker

Asagiri Masamune is five years old and has a System inside him. The System says that getting close to Tsunade will earn him Medical Ninjutsu, getting close to Jiraiya will earn him the Rasengan, and getting close to Minato will earn him the Flying Thunder God technique. But the System never said that using these abilities would make him forget the most important people in his life. It never said that it was the greatest enemy of all.