That's it, I remember now,

Merry, have you heard the rumor about the ghost mansion?

This time it's a story about strange fires.

Strange fires? Sometimes called atmospheric ghost lights, these lights (or fires) appear in the atmosphere without an obvious cause. Examples include the hitodama and will-o'-wisp.

The place is called Nijo Yatsushiro Mansion, and even though it's an abandoned apartment, apparently, at midnight, a light comes on in one of the rooms on the top floor.

Isn't there still electricity?

There's no electricity or gas, as far as I know.

So maybe it is the result of someone's kidomadeshi? test of courage

Right.

But if there are people who come to test their courage...

....! That's how easily a boundary between reality and fantasy can be created... I see.