Deep Insanity: The Lost Child

What would you like to edit?

Alternative Titles

Japanese: Deep Insanity THE LOST CHILD
English: Deep Insanity: The Lost Child
More titles


Type: TV
Episodes: 12
Status: Finished Airing
Aired: Oct 13, 2021 to Dec 29, 2021
Premiered: Fall 2021
Broadcast: Wednesdays at 00:30 (JST)
Licensors: Funimation
Source: Other
Genre: Sci-FiSci-Fi
Duration: 24 min. per ep.
Rating: PG-13 - Teens 13 or older


Score: 5.591 (scored by 1239512,395 users)
1 indicates a weighted score.
Ranked: #113252
2 based on the top anime page. Please note that 'Not yet aired' and 'R18+' titles are excluded.
Popularity: #3355
Members: 43,546
Favorites: 244

Available At


Streaming Platforms

Ranked #11325Popularity #3355Members 43,546
Add to My List
Episodes: /12


Madness and unawakening sleep, Randolph syndrome.

This new illness is slowly but steadily approaching humanity, caused by the huge underground world Asylum that appeared in Antarctica. There are strange creatures different from the earth, and unknown resources. People bet their lives on the depths of the mysterious new world to get huge wealth, organizational plots, or their own ambitions.

And here alone, a young man with a wish in his heart is trying to challenge the front line of Asylum.

(Source: MAL News)


The multi-media project includes an anime, a manga and a video game. The anime's story is set between the manga and the video game's story.

Episode Videos

Characters & Voice Actors

Mochinoki, Sumire

Hondo, Kaede




Suzuki, Ryouta

Ron, Blake

Ono, Yuuki


Morinaga, Chitose


Onizuka, Kousuke
Herek, Samantha
Assistant Producer


Opening Theme

Apple Music
Amazon Music
Youtube Music
"Inochi no Tomoshibi (命の灯火)" by Konomi Suzuki

Ending Theme


Jul 20, 2023
Best Sci fi anime of 2021
The only thing went wrong was that they weren't able to sort out the plotlines

The MC's are Shigure and Vera. That was unexpected from their intro pov. Watching the first episode you would never expect that.
The relationship development aspect amongst the platoon was unexpectedly good as they were the only ones introduced.

The Art and fight scenes were awesome and the supernatural in it was another awesome sight to behold.

Jan 28, 2022
Mixed Feelings
It's quite complicated to talk about Deep Insanity as it is so uneven.

Indeed we find a very complex scenario but once it is finished it makes sense. Sometimes it's even too complex and tries to make things confusing where they don't need to be, but the scenario remains relatively readable and not unpleasant to follow.

In the same way we have interesting characters to see evolve and develop, especially one whose name I won't mention to keep the surprise for those who haven't seen the anime. But here again the development of the characters is only interesting when it's set up, once that's done everything is ...
Jan 24, 2022
Just plain awful. When I first saw the title and cover visual of this anime, I *thought* it was going to be really good and exciting, but when I watched the actual show, I quickly lost enthusiasm and enjoyment after the first three or four episodes. I was duped, the title was a bait. I expected stuff to be more intense and suspenseful.

First, the story was boring and not interesting, the characters just going on missions down the labyrinth fighting monsters with cringe CGI animation and some sort of evil underground organization that doesn't much catch the viewer's attention. Later, the series enters a time ...

Interest Stacks

by Gino99
50 Entries · 11 Restacks
19 Entries · 5 Restacks
16 Entries · 8 Restacks


Recent News

North American Anime & Manga Releases For December

North American Anime & Manga Releases For December

Here are the North American anime, manga, and light novel releases* for December. Week 1: December 6 - 12 Anime Releases Gekkan Shoujo Nozaki-kun (Monthly Girls' more

Fall 2021 Simulcast List [Update 12/26]

Fall 2021 Simulcast List [Update 12/26]

In this thread, you'll find a comprehensive list of anime acquired for simulcast release during the Fall 2021 season. Anime series licensed for home video more

Recent Forum Discussion

Why are people giving this a 10/10
ImFlyingFrog - Oct 17, 2021
26 repliesby Piromysl »»
Jan 29, 10:12 AM
Poll: Deep Insanity: The Lost Child Episode 7 Discussion
Stark700 - Nov 23, 2021
15 repliesby Dawizz »»
Jun 1, 2023 9:40 AM
Poll: Deep Insanity: The Lost Child Episode 6 Discussion
Stark700 - Nov 16, 2021
23 repliesby Dawizz »»
Jun 1, 2023 9:24 AM
Poll: Deep Insanity: The Lost Child Episode 12 Discussion
Stark700 - Dec 28, 2021
30 repliesby BlaizeV »»
Mar 13, 2023 2:30 PM
Poll: Deep Insanity: The Lost Child Episode 1 Discussion ( 1 2 )
CRG - Oct 12, 2021
90 repliesby BlaizeV »»
Mar 12, 2023 2:47 PM