Mana Awakening:Rainkarnation

It's about a 14 yo boy who died and when he woke up he saw a knight then he realized that he was reincarnated this knight took care of him for 8 years until one day he met The princess of Rosehold who knew the prince of Moonhold they quickly became friends one day when they were out for a walk they met a woman who said that she is a master of Mana and she wants to train the 8 yo Athur because he has potential for Mana. From then on he spent 5 years learning how to control Mana and how to use it After five years he went his own way.