This is a 3D simulation game.

Player will be playing a high school student. Inside player's class, there are 21 students. Each day, one of these students will disappear (get killed or…). This game is similar to the game "The Werewolves of Miller's Hollow". However it is a single player game. The aim of the game is to find the killer (one of the students) before the total number of students become less than half (<11) or player dies. The 'killer' will be contacting player through texts during daytime (while everyone is at school). Also player can freely explore the classroom and talk to anyone in the class. There will be items player can collect. From the items and the conversations, there will be hidden tips/clues on which student the killer is aiming at on that day and who the killer is (however is it every hard to notice).

On the first day (the very beginning of the game), player can choose to protect 10 students. These number will go down by one as each day passes (e.g. on the second day player has 9 choices and the third day it becomes 8 and so on). Player can choose anyone to protect (including him/herself). When the number becomes 0, player can protect no one and the game will end if player gets killed.

At the end of daytime of each day, player has one chance to name the killer. If it is right, player wins. But if it is wrong, player will be punished by losing the chance to name the killer next day. If player wins, he/she will get game points (bonus points for each survivor), which can be used to buy different things during next game.

Each of the students has their own personalities and stories. Depending on player's choices, the conversation will change and the amount of information player can get will different too. Player can buy and give presents to anyone (by using game points) to gain friendship.

The killer will be different for each game (and there will always be a reason for everything). However the students will always stay the same. Player can get to know more and more about them and eventually there will be special event happening between player and each students (if player become close enough to that student). In each game, there will be many things to do outside of finding the killer (e.g. become friend with someone; play little games with someone; help someone with homework or something; answer questions during classes and so on). Player can really enjoy the high school life and feel the connection between the characters.