Deep Insanity: The Lost Child

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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: 23 min. per ep.
Rating: PG-13 - Teens 13 or older


Score: 5.591 (scored by 1250612,506 users)
1 indicates a weighted score.
Ranked: #113282
2 based on the top anime page. Please note that 'Not yet aired' and 'R18+' titles are excluded.
Popularity: #3386
Members: 43,798
Favorites: 243

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Ranked #11328Popularity #3386Members 43,798
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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.

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

Episode Videos


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.

Dec 28, 2021
Mixed Feelings
The story starts with the 1st episode establishing the setting,then 1 episode each for everyone of the main cast to be fleshed out and establish the bond with the MC,while the rest is about unveiling the plot.

All the important characters are fleshed out a lot,expect for the main villain sadly,the main character starts pretty weak but develops pretty well and has good pay off to his development and so does fleshing out his bonds with the others.

If you can get past the horrible CG with the mostly bad animation,which admittedly is a pretty big hurdle then you are left with a decent cast of characters,a ...
Dec 28, 2021
Spoilers be warned, though I find no incentive of hiding the full fact from all of you.

Just who was this show made for, other than to promote Square Enix's brand new IP: Deep Insanity? No, not one, it seems. In all circumstances, this show is just outright horrible on every angle, and this is a classic case study of how NOT to formulate an anime that wastes everyone's time and money, resources of which are timeless and cannot be earned back.

For one, Deep Insanity hinges very heavily on its mixed-media themes, because without the context of either one of them, you would be very lost, ...

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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