The twin ghosts, Hanako and Tsukasa were now accidentally back in time. Most likely in 1600 Japan.

For a reason, their family legacy had a curse that passed on each generation. The "Darkness" curse, eyes are just fully black and you go totally insane on command.

They also met a princess. Princess Nahida Yugi. Oh, they were in the same family! Forgot to mention, but, they know about their ancestors but not her because they're kinda modern. Oddly, she asked them to come meet them at the palace, which they did, and surprisingly the guards let them in only because its her.

In Nahida's bedroom....:

Hanako: Hello, Princess. Why did you call us?

Tsukasa: Yeah, and the guards seemed to not care that it was you we were visiting.

Hanako discreetly pinched Tsukasa's arm under the table, silently telling him to stfu.

Tsukasa: Ow, Amane, it hurts!!-