Deep Insanity: The Lost Child (2021)
A dark sci-fi anime set in a deadly underground world beneath Antarctica, where one soldier's personal mission collides with humanity's survival.
Deep Insanity: The Lost Child - Series Information
- Original Title: ディープインサニティ ザ・ロストチャイルド
- First Air Year: 2021
- Last Air Year: 2021
- Type: TV Series
- Genres: Animation, Sci-Fi, Fantasy, Action, Adventure
- Content Rating (US): TV-14
- Episode Runtime: Average runtime per episode (24 minutes)
- Number of Seasons: 1
- Number of Episodes: 12
- Status: Ended
- Original Language: Japanese
- Spoken Languages: Japanese
- First Air Date: October 13, 2021 (United States - TV-14), October 13, 2021 (Canada - 14+), October 13, 2021 (Australia - M), October 13, 2021 (Brazil - 14), October 13, 2021 (Mexico - B-15)
- Networks: Tokyo MX
- Production Companies: SILVER LINK.
- Production Countries: Japan
- Alternative Titles: Deep Insanity: The Lost Child (DE), Deep Insanity: The Lost Child (US), 深い狂気：失われた子供 (JP), ขุมนรกอันบ้าคลั่ง (TH)
Deep Insanity: The Lost Child - Plot
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.
Deep Insanity: The Lost Child - Trailer
See the action unfold in the official trailer for Deep Insanity: The Lost Child.
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Deep Insanity: The Lost Child - Cast & Crew
Main Cast
- Hiro Shimono
- Ami Koshimizu
- Kohsuke Toriumi
- Yuya Hirose
- Ruriko Noguchi
- Kaede Hondo
- Takako Tanaka
Writers
- Kento Shimoyama
Deep Insanity: The Lost Child - FAQs
What is Deep Insanity: The Lost Child about?
The series is set in a near-future world where a mysterious illness called Randolph Syndrome plunges people into an unending sleep. The cause traces back to Asylum, a massive underground realm discovered beneath Antarctica, filled with alien creatures and untapped resources. A young soldier named Daniel Kai Shigure ventures into its depths driven by a deeply personal wish.
Is Deep Insanity: The Lost Child based on a true story?
Not at all — the series is a work of pure science fiction. It originated as a multimedia project combining a manga, a mobile game, and this anime adaptation. The concept of a subterranean world beneath Antarctica and the supernatural sleeping sickness at its core are entirely fictional inventions.
Where can you stream Deep Insanity: The Lost Child?
The series is available to stream on Crunchyroll, including through the Crunchyroll Amazon Channel. If you prefer to own it, episodes can be purchased on Amazon Video and Apple TV Store. Availability may vary depending on your region.
Who voices the main characters in the series?
The lead role of Daniel Kai Shigure is voiced by Hiro Shimono, while Ami Koshimizu brings Vera Rustamova to life. The supporting cast includes Kohsuke Toriumi as Leslie Blanc, Yuya Hirose as Lawrence Larry Jackson, Ruriko Noguchi as Reika Kobato, Kaede Hondo as Sumire Motiki, and Takako Tanaka as EL-Cee.
What is Randolph Syndrome in Deep Insanity?
Randolph Syndrome is the mysterious illness at the heart of the story — a condition that traps victims in a permanent, unawakening sleep. Its origin is linked to Asylum, the colossal underground world discovered beneath Antarctica. The syndrome drives much of the plot's urgency, as humanity scrambles to understand and survive its spread.
How was Deep Insanity: The Lost Child received by critics?
Critical reception was mixed. Reviewers appreciated the striking visual design of the Asylum setting and the atmospheric world-building, but many felt the narrative moved too quickly to develop its characters or premise fully. The series was seen as an ambitious concept that struggled to deliver on its potential within its 12-episode run.
What anime series are similar to Deep Insanity: The Lost Child?
Fans of the series may enjoy Tengoku Daimakyo for its post-apocalyptic mystery and creature-filled world, or MAKE MY DAY for its sci-fi survival tension. Tales of Zestiria the X and BNA also share a similar blend of action, fantasy, and supernatural world-building that fans of Deep Insanity are likely to appreciate.
Who wrote the screenplay for Deep Insanity: The Lost Child?
The series screenplay was written by Kento Shimoyama, who handled the script adaptation for the anime. The production was handled by SILVER LINK., the studio known for working on a range of action and fantasy anime titles. The series aired on Tokyo MX in Japan beginning in October 2021.
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