The girl is an extraordinary gifted child.
He was placed in a foster care facility before he was one year old.
That happened not long before girls could talk.
At that moment, she could play the game.
Calls himself Smart Checker and plays several games.
Because it's so boring that no one has fun playing with it.
Then two years passed.
A girl meets a woman who seems to be her mother.
A boy seven years older than himself.
Faced with the conversation with adults and actually echoed their voices.
He showed an empty and inorganic smile.
The girl who had been silent for a long time spoke.
Really... Empty.
Hey, let's play a game!
"Heaven Descends" the Beloved