Made In Abyss Vol. 5

Riko is an orphan who lives at the Belchero Orphanage in a town named Orth. This town happens to be on the edge of the Abyss, a mysterious cave system that stands as the only place in the entire world that hasn’t been fully explored. Riko decides that she wants to be a Cave Raider, people who try to explore the Abyss, and one day while exploring it discovers a robot that resembles a human boy. Together with her new friend, she ventures forth deeper into the Abyss not knowing what could be waiting in its dark depths.
Notice: This manga is written in Japanese.