修業旅行～古都迷走地図～

Nanbu Shouhei lives and attends a high school in Tokyo but in his childhood, he briefly attended kindergarten in Kyoto while living with his mother and maternal side of the family there.

He started playing an online fantasy RPG called Fang of Ouroboros three years ago and met a player who rescued him when he was a newbie. The other player claimed to be Senke Tomonari, who had been one of his kindergarten classmates in Kyoto. They became close buddies through the game though they never met or talked over the phone but only communicated online because of the distance.