紙魚

像金鱼又像鲶鱼的奇怪生物。 主食是文字。被吃掉重要文字的书籍，会迷失后续的发展。 被白姫触碰后化为墨汁，黒筆将其归还给书籍后，绘草纸就会想起原本的剧情。

摘自本作简介中该角色的段落

Strange creatures that appear to be somewhere between goldfish and catfish. They are bibliovores, and when they eat critical portions of a book's story, the story can no longer progress. Shirohime turns them to ink by touching them, and Kurofude returns the ink to the pages, thus restoring the illustrated books' original forms. [From ANIPLEX.EXE]

简介来自 VNDB