Deep Insanity: The Lost Child

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Alternative Titles

Japanese: Deep Insanity THE LOST CHILD


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


Score: 4.941 (scored by 40254,025 users)
1 indicates a weighted score.
Ranked: #115792
2 based on the top anime page. Please note that 'Not yet aired' and 'R18+' titles are excluded.
Popularity: #3309
Members: 30,111
Favorites: 198

External Links

Ranked #11579Popularity #3309Members 30,111
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Episodes: /12
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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)


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Characters & Voice Actors

Ron, Blake











Oonuma, Shin
Gou, Fumiyuki
Sound Director
Shimoyama, Kento
Script, Series Composition
Suzuki, Konomi
Theme Song Performance


Opening Theme

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

Ending Theme

"Shinju-iro no Kakumei (真珠色の革命)" by Kashitarou Itou

Nov 2, 2021
Daxonzion- (All reviews)
Seasonal animu review time

This anime right here actually picks my interest the first time when the PV drops. It shows a nicely animated scene and actually gives off some mysterious vibes to it, making me interested to watch it and thinking this could be a potentially good animu. But those interest starts to fade away right after the 1st episode drops, as it is one hell of a monotonous episode, and that monoton quality stays constantly as the episode goes on, at least on the first 4 episodes.

Let me explain why

The 1st episode of a show should be the starting point to read more
Nov 4, 2021
Legend0fJulle (All reviews)
Initially seeing the synopsis for the anime I was rather excited but after watching a few episodes the show seems to have none of the great qualities made in abyss (the one I kind of compared it to based of had), just a sad pit full on even sadder story building, characters etc.

The characters are bland and kind of annoying as well. You got the standard main character who wants to be a hero despite having really nothing going for him, a tsundere idol, the kuudere, some random guy side character who has no ability to feel fear and Leslie, probably the closest read more
Nov 19, 2021
i-like-this (All reviews)
Deeply Insufferable: The Lost Cause.

Deep Insanity is another anime which has literally nothing to offer.

The stories premise is pretty much a Sci-Fi version of Danmachi. A strange, underground labyrinth world which produces strange creatures and resources appears and soldiers/miners are sent down my military and political organisations to secure it's power and riches. The only problem is that the underground world is also responsible for Randolph syndrome, a madness inducing illness which is slowly destroying humanity.

If you enjoy boring, forgettable characters fighting ugly cgi monsters then you still won't enjoy this turd. Shigure especially is unbelievably infuriating protagonist to watch. A naive kid read more
Nov 3, 2021
Invirent (All reviews)
I like the initial concept of the story, and i do enjoy the anime quiet a bit. I am not a person who complain a lot about art but i think the anime suffer from the fact that the anime seems like an advertisement for the game and it make the story and dialog kinda dry for me.

I think the main protagonist dialog is kinda short and dry is because of self insert element from the game. And the anime is bland, kinda like most anime which came from games .but overall it's a decent anime to watch if you kinda bored and have time read more


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