The Game of Monsters

Takashi, Seiko, Miki, Yuri, and Sekai have been friends from the very start of their childhood. They made a group called the Monster Hunters when they were young. They believed in monsters, but in a good way. They would always pretend to fight monsters with sticks and other things they could find laying on the ground.

One day, Sekai plans to move their club to a new location. It's inside an old mansion that no one lives in. When the friends go inside of the mansion, all exits of the mansion immediately disappear. When this happened, Sekai randomly disappears.

Join the four friends as they attempt to find Sekai and escape from the mansion, even when they are unaware that there are other things in the mansion...