└ literature
      ├ Science Fiction, Mystery
      ├ Japanese literature
      ├ nonfiction
      ├ foreign literature
      ├ documentary
      ├ foreign literature
      ├ 17x11 cm paperback book
      ├ Japanese literature
      ├ Travelogue, Essay
      ├ book guide
      ├ Women's Bookshelf
      ├ Books
      ├ library
      ├ Tanka, Haiku
      ├ Miscellaneous, Knowledge
      ├ biographical sketch
      ├ Miscellaneous Library
      ├ one's world view
      ├ military history
      ├ special library
      └ literature in general
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