Nanachi is a Hollow, with somewhat rabbit-like features. As a child, Nanachi and a young girl named Mitty (ミーティ Mīti) were sent down to the sixth layer in one of Bondrewd's experiments. On their return, Nanachi became partially inhuman, while Mitty lost all of her humanity and became a grotesque, immortal assortment of flesh and misshapen limbs. Nanachi escaped with Mitty from Bondrewd's laboratory to spare her the pain of his cruel experiments, cared for her until after her death, and then agreed to join Riko and Reg on their travels to the lower layers. Nanachi always uses gender-neutral pronouns, and the writer has left Nanachi's gender intentionally ambiguous.
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