I Wanted To Save My Mother So I Became A Hero(LN)

Yukio Katakana was just about to go on his first day of college with his mother when they happened to come across a possible traffic incident. Just when his mother was about to be hit by an unmanned truck, the God of Sealing Clodwal has given him a chance to save his mother in exchange of saving his world from an impending crisis! What will happen to his life now after being reborn in this world of swords and magic with the duty to protect the world?