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Yami to Boushi to Hon no Tabibito (The Darkness, the Hat and the Traveler of Books) is a hentai visual novel game and non-hentai, 13 episode anime series. They follow the travels of Hazuki, a quiet high-school girl, as she searches for her vanished older sister Hatsumi throughout many different "book worlds." She is accompanied by the strange caretaker of the book worlds' library, Lilith- who wears the ginormous single-eyeballed hat referred to in the title - as well as a talking parakeet, Ken-chan. They are most popular among shoujo-ai fans, as a majority of the female characters are blatantly attracted to Hazuki.
Hazuki's herself has a brooding, serious personality, is incredibly skilled with her sword, but also has an vulnerable romantic side. She is tall, has long dark hair, and striking blue eyes. This is a common design in shoujo and also in yuri of female admiration objects (something akin to the yuri equivalent of seme). She idolizes the older (but more petite) 'stepsister' Hatsumi to the point she sometimes considers her blatant sexual attraction vulgar.
