Made in Abyss - Season 1

Season 1 - An enormous pit and cave system called the "Abyss" is the only unexplored place in the world. Strange and wonderful creatures reside in its depths, and it is full of precious relics. The adventurers who venture into pit are known as "Cave Raiders." An orphan girl named Rico lives in the town of ?su on the edge of the Abyss. Her dream is to become a Cave Raider like her mother and solve the mysteries of the cave system.