Yamibo: Darkness, the Hat, and Travelers of the Books

Hatsumi Azuma disappears on the morning of her 16th birthday. Along with a feathered companion and a keeper of the Great Library named Lilith, Hatsumi's adopted sister, Hazuki, goes world-hopping in search of her.

On board the train, Yoko confronts the Colonel and is sheltered by the Siberian Tiger who brings Adam to her. They are confronted at gun point by a drunk and a train conductor who are also undercover spies. Everyone except Yoko is killed, as the Siberian Tiger's treachery plays out. Yoko recovers and the trio bonds. With Hazuki, they take down the Siberian Tiger. They find the hidden explosive and hand over the decoder at their destination.

Hazuki arrives in the Great Library and meets Lilith. She learns that she herself possesses the essence of Yami, once the protector of the Great Library. Hazuki accepts Lilith's help traveling the worlds and Hazuki, Ken-chan and Lilith set off in search of the missing sister.

Ritsuko is serving the Princess Mariel. Mariel falls for the charms of Gargantua, now an alchemist. His attempt to sacrifice her is foiled by Ritsuko, but the princess is rendered half-demon and takes her own life. Lilith appears before Gargantua and accepts Mariel's soul as payment.

Hazuki and Lilith reach a prehistoric world. Lilith is mistaken for a god. A cavegirl named Quill develops an attachment to Hazuki, offering herself up as a sacrifice. The real god appears but is defeated by Hazuki. The search is another dead end.

Hazuki and Lilith arrive on an island and meet a young girl, Milka, her white tiger, and the demoness Seiren. Milka does not age and suffers from mindquakes related to the Great Library.