Deep Insanity THE LOST CHILD
A mysterious illness. An underground realm at its origin. Gifted with immunity, one young man enters to find a cure.
Starring Kaede Hondo, Hiro Shimono, Yuya Hirose, Ami Koshimizu, Kohsuke Toriumi, Ruriko Noguchi, Takako Tanaka
Watch "Deep Insanity THE LOST CHILD" on Amazon Prime released in 2021. It's a animation and sci-fi & fantasy show, and has a rating of 5.2 out of 10 from Imdb which is fairly okay for this kind of show.