Overview:

Nanako suddenly received a phone call. This call told her that she would face her ordeal. Suddenly, Nanako
Child○ entered a mysterious world. This world is full of strange creatures. Mermaids, spiders, slimes! Monsters, plants. If you want to go out, you have to overcome challenges.

Suddenly, I received an unknown phone call.
I came to an unknown world
A trial to face her past sins
Meet the goddess of the forest