Cthulhu Mythos.
Is it a fictional existence? Or--.

This story is one of all the events that happened in the world.
It is "Ibunroku" that records the history behind the scenes.

There is a history unknown to the world.
A story hidden for some reason.
A story that you can't believe even if you talk.

This story is
It's just one of the stories that summarizes such rootless and leafless rumors.

In this story, you can stand by and be actively involved.
You can choose according to your own ideas.

You are in this story, there are many,
You can find out what happened there from a wide variety of options.

The record is now in your hands.

Choose.
Unravel history.

You became a witness to this "Ibunroku"
Become a party.