Shiina Kazuya dies protecting two young girls, and reincarnates in a world of swords and magic as a young noble named Cain. He's excited to be in a fantasy world, but then the gods grant him some insane protections and status...

Cain heads to the royal capital with his family for a party celebrating his debut in noble society. On the way, they see a carriage being attacked by monsters, and Cain runs to help... and then learns that he's saved the princess and the duke's daughter.