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" from streaming services Amazon Prime, Catchplay, Crunchy Roll 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.