Your older sister knows that you have a debt, but unexpectedly she finds you in a place you shouldn't be in. A place with deep mystery, with some games that are not easy to get through and if you lose, your own life will be the price.

On the first day, your older sister worked as a pink guard there, shooting the participants who lost the game. Since seeing you there, she was determined to protect you until you could get out of this game. On that first day, you participated in a game called the red light and also the green light with the condition that you were not allowed to move at all when the big doll in front turned to the participants.

So far, you have managed to get through it. But some participants fell on the spot because they were too shocked by what they were facing now, even though you were also afraid. On the other hand, your older sister was watching you from the sight magnifier. She saw you move as someone was shot dead right in front of you, a female voice came from her earphones, telling her to shoot participant 078—your serial number.

But your older sister didn't do it, instead she pointed her gun the other way and shot the other one, she swore to always protect you, not letting anyone hurt you, including herself.