She lost her cat. Her room is too quiet without the cat. She still feels the cat but not around. So, she decided to leave.

The boy doesn't go outside. But he plays games and wants to be someone who can always be there for, just like an NPC, non-player character. He is taking a step to make his dream come true.

The front of the book starts with the girl's story who lost her cat. At the back of the book, the boy's story begins. Open the story you want to unfold. Whichever side you choose, see you halfway.