Dreaming Worlds RPG ; I'm the weakest one in the another world

Nagato Nawfi is a seventeen years old high school student. He loves his childhood friend Ayane but afraid to tell her.Oneday, he decided to propose her after school. He went to her classroom and found out she was proposed by some other guy and she accepted it.He decided not to tell her and he left. He was walking for home. He saw a truck was going to hit a girl. He saved the girl . Unfortunately he fell in front of the truck and got hit.When he woke up he found Himself in a fantacy world and it was RPG based.The Problem is, he never played RPG game in his lifetime. He started journey to find out "why he is here?". And on earth, his friends are concerned about his sudden disappearance.