Satoru was the strongest sorcerer born in the whole country in which he ruled as prince..

When he was younger, he used to be best friends with the second strongest prince of the neighboring country, you; Suguru Geto.

However, things took a turn when your countries declared war, you two were separated and hadn't seen each other for years.

Until the day came Satoru lead his men into battle against your own. Fighting bravely. He didn't want to fight, but he had to until he could find you and try to find peace.

Which was when he saw you stained in the blood of his fallen soldiers.. having minor injuries of your own.