In the VRMMO CtG (Cradle to the Glaive), Kasugai Yuu has married with Miifa, a girl whom he just met. But after that, a child named Haruha was born and started to grow up?! More over...
"I'm coming, Papa!"
Even in the real world, the real Haruha and her mother Miifa, rather Kugimiya, also appeared! Living in the same roof, Yuu and Miharu, in-game and in real life, have to raise and educate Haruha, the one who can change the fate of humanity?!