Bungou to Alchemist: Shinpan no Haguruma

The characters from both anime have the same names based on Japanese authors from the past and there are similarities between the characters in BSD and BTO. 

Watching the BunAru anime and wanting to see animated adaptations of several of the works of fiction written by the authors who appear in it? Try out Aoi Bungaku Series. It in particular features adaptations of well known works by Akutagawa Ryuunosuke and Dazai Osamu. It is a must. 

Both have male MC's Both have same alure and story, to keep history and keep novel's alure straight. Fight for nuisance creature.  

-sword materialization/author materialization -fight against evil organization to protect the history/story world -new swords/authors joins the cast as story progresses 

Both of these series revolve around combating the dangers of tainted books. In 'Nil Admirari no Tenbin' the tainted books are literal threats that cause their readers to self-immolate. In 'Bungou to Alchemist' the tainted books are ones at risk of being erased by changing their endings, and reincarnations of various famous Japanese authors must delve into the books to prevent this from happening. 

both the series is about select hereos (authors/storybook main characters) who fight against evil trying to change the stories in famous books/fairytales