MonstrousPark

A "very bad" amusement park that only opens at night.
Attractions which don't function, amateur employees (cast members), lousy shows, and terribly run-down gardens...
Three new cast members are sent to various departments for on-the-job training.
At the training facility, they hear a rumor.
There is a "monster" lurking in this amusement park.

[Translated from the official website]