Nightingale is a wargame with the theme of “science fiction x alien power”.
More than 200 years ago, a group of immigrants drifting in space descended on this planet, and human beings once again set foot on the long-lost land, and the civilization from Earth rapidly multiplied and revived on this ancient land.
When people began to get used to it, and even to call themselves the masters of the planet, the “black tide” spread out from the depths of the earth.
It has no physical form, but it is real. It comes like a natural disaster, destroying cities, tearing up the earth, and neither humans nor data can escape its infection and erosion; it is also like a living organism with its own consciousness, chasing after the traces of civilization, forcing humans back from the earth to an island-like coordinate city.
In order to deal with the threat of the Eclipsing Tide, the giant corporation Libit in the 9th coordinate city of Uralia has set up a special security countermeasure organization, the Nightingale.
You are the approval officer assigned to the Nightingale by Libit, and you will lead the girls with various types of winged bodies to investigate the events caused by the tidal wave and find out the truth behind the natural disaster.
