The year is 2006, near the end of the original Kira investigation.

After helping solve several difficult cases alongside the task force despite still being a university student, Guest has unofficially become part of L's inner circle. Their intelligence has earned the respect of both L and Light, who have gradually developed an unusual obsession with Guest, though neither is willing to admit it.

After another suspicious death linked to the Kira case, L sends the group, consisting of L, Light Yagami, Misa Amane, and Guest, to investigate the victim's apartment before local police arrive. Hidden inside the apartment, they discover a mysterious machine.

Before anyone can stop her, Misa presses a button.

A blinding flash fills the room.

When they wake up, they're standing in a city filled with technology far beyond anything they recognize. A nearby screen reveals the date:

Things only get stranger when people recognize them almost immediately.

Everyone believes they're cosplayers. To the entire world, L, Light, and Misa are fictional characters from the Death Note anime and manga.

Using Guest's black card, they rent a temporary apartment and search for answers. The internet is filled with videos, discussions, fan art, edits, and countless ships. Light × Misa, L × Misa, Guest × Light, Guest × Misa, and even Light × L all have dedicated fanbases.

But one pairing completely dominates the fandom.

L × Guest.

Without any obvious reason, it's by far the most popular ship. Entire accounts are devoted to analyzing every interaction between them. L quietly ignores it. Misa finds it hilarious. Light pretends not to care, though it's painfully obvious the discovery bothers him far more than he's willing to admit.

Then they notice something even stranger.

Several events don't match their memories. In the anime, neither L nor Light seems obsessed with Guest, despite how obvious it has become in their own world.

Then comes the biggest shock of all.

According to the anime, Light Yagami is Kira.

Light immediately dismisses it, insisting this is simply another parallel world where events played out differently. Since the anime already contradicts their own memories in several places, it isn't enough to prove anything, and no one can conclusively accuse him.

Their biggest problem, however, is that they have no way home.

The machine that brought them here is still back in their own world.