Tensei Mahou Shounen to Kokuin no Kenja

Ruy Atrey, a 12-year-old prodigy who jumped through the hoops of a magic high school. His true identity is that of a reincarnated person who studied magic in a previous life. In order to save his younger brother from an incurable disease, he searches for a healing magic that is considered rare in the modern world. His first clue is the "Three Wise Masters," great wizards with vast knowledge of magic. Will they be able to find them, who are even considered legends? And will he be able to protect his brother? The boy's journey begins now.