Available on Prime Video, Crunchyroll

A mysterious illness has put millions in comas. An underground realm has appeared at its origin: Antarctica. Strange creatures make up its population, and undiscovered natural resources make it a gold mine. Many humans enter in search of fortune, but Daniel Kai Shigure searches for something deeper—a cure. Gifted with immunity to the illness, he might be humanity’s last hope.

Anime · 2021 · 24 min

Starring Hiro Shimono , Ami Koshimizu , Kaede Hondo

Director Shin Oonuma

EPISODE 1

Take 01

A strange disease is linked to a mysterious hole leading to an underground world: the Asylum. "Sleepers" go into this world to fight strange monsters and recover unknown resources. Now, a young boy who dreams of being a hero has arrived at the Asylum.

23 min · Mar 25, 2023
EPISODE 2

Take 02

As Shigure begins to settle into his new life as a Sleeper, he starts to wonder what he's good at, and what he can accomplish down in the Asylum.

23 min · Mar 25, 2023
EPISODE 3

Take 03

Larry goes on a dangerous and illegal mission deep into the Asylum, and forces Shigure to come with him.

23 min · Dec 20, 2022
EPISODE 4

Take 04

Shigure investigates the past of XO Leslie when a mysterious assailant suddenly ambushes them.

23 min · Dec 20, 2022
EPISODE 5

Take 05

Shigure is always awkward around Kobato, and the rest of the team thinks he might have a crush on her. They scheme to set them up, but...

23 min · Mar 25, 2023
EPISODE 6

Take 06

The day of the plot has arrived and the team heads into the Asylum. But when Hayden appears during the mission, things go very wrong.

23 min · Dec 20, 2022