Beyond the edge of perception is a magical library, where each book is a gateway leading to a different world. The library is thrown into turmoil when the power shards of Eve splinter across all the different book worlds. Enter two unlikely heroes: the young girl Hazuki and Koge, an unwitting "Hunter," whose destiny it is to protect the various incarnations of Eve. Together, they must retrieve the power fragments before they fall into the wrong hands!
Source: ADV Manga
Yamibo: Darkness, The Hat and the Travelers of the Books