Mankind can no longer reproduce because of gene manipulation aimed at making life longer. The clones ruling the bottomless underworld may have become fertile. Parton is selected to go on a mission through a subterranean labyrinth crawling with monsters to secure humanity's future.
PartonMain
AlexanderSupporting
FrancisSupporting
JulianSupporting
NicoSupporting
HokuroSupporting
Doctor LuchiSupporting
Jyoshu SatouSupporting
Jyoshu AdachiSupporting
IQ-PSupporting
MiiraSupporting
PerriotSupportingAniList supplies these relationships. Prequels and sequels connect the story; they do not establish a complete viewing order. Adaptations and source manga are separate works, without an assumed Episode-to-Chapter match.
