Made in Abyss: Retsujitsu no Ougonkyou

Riko has now earned a White Whistle, allowing her to explore the sixth layer of the Abyss, known as The Capital of the Unreturned. Along with Reg and Nanachi, she sets out to uncover the secrets of this uncharted domain.

The trio soon discovers a village inhabited by strange creatures called "hollows." Despite the feeling of unease, they continue on their expedition to uncover the mysteries of the settlement and the legacies of the adventurers who once descended into the Abyss.

As they explore, they face dangerous creatures and treacherous landscapes. Despite the danger, they bravely venture onward to discover the secrets of the Golden City, and the truth of the Abyss.