"I don't know where you are, I don't remember your face or name. I don't even know if you really exist. But I promise I will find you." "This mail was sent from the future..." Winter, year 2045. Kirishima Reiichi, who belongs to the AI research club, had finally succeed in developing an artificial intelligence called "Apeiria". Using the functions of Apeiria, he made the technology called "VRMMO: the virtual world", which is a fusion of magic, science and all those things from the books. However, VRMMO was a dangerous game with no control. Unfortunately, Apeiria was captured in the virtual world. Now the protagonist and his friends: his step sister Miu, a rude girl with no friends, his kouhai Mashiro, which wants to be his "slave" and Kuon, a girl with a kind personality, who had chuunibyou syndrome two years ago have to rescue Apeiria from the virtual world. This is story about love, youth and science.