The main character is a weak girl.
The stage is a mysterious facility surrounded by concrete walls.

The facility has already begun to collapse, and they are forced to escape in order to survive.
However, the facility has a gimmick that prevents escape.
The key to this is the 100 diverse animals that live in the facility.

Each animal has a special ability.
One with an excellent sense of smell, one with excellent eyesight, one with a small body, and one with a large body.
With their help, gimmick capture becomes easier.

Animals are full of individuality, and each of them has their own worries and wishes.
To befriend animals, you have to listen to their demands.

Sometimes animals lose control and attack.
A runaway animal can be brought back to life by covering it with a bucket of water.
Run away without getting caught until you get water.