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
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.
Watch it here
Not found streaming from India.