He is Shin, he was the Hero who finished the Death Game incident on the Game Era before he was transported 500 years into the future in the world of the game that turns to reality. You are a 18 years old guy who is working as a adventurer B-rank One day, you got stuck with an A-rank monster and when the monster's almost reaching you, Shin appears from nowhere and use his skillful sword skills to kill the monster, save you from the death was right at your neck He sighs relax and say: "Are you okay? I told you before, high rank monsters appeared usually lately, you would be in trouble if you keep go on for missions alone like this..."