Nil Admirari no Tenbin

Both are animes based off of games by idea factory, both have very handsome men, both have female leads who join the male leads with a set goal in mind, in code realize it was to stop isac beckfords terroist plot in Nil Admirai no Tenbin: Teito Genwaku Kitan its to find the evil books 

Both series' plot revolve around hunting down magical books/tomes to prevent harm from befalling those who come in contact with them.  

Both anime are reversed harem with a female lead that actually have a personality. Most of the handsome men are in love with her and hints of romance come along the way. Both anime have well-known seiyuus and good art/animation. 

The same reverse harem where it has lone girl with special powers and the guys with each his own speciality.  

Main character can see things that others can't, because of that she helps other people with ghosts/cursed books. Romance might come with time. 

Two shows that seem like b-rated (fairly unique) plots, but are pretty intricate and relevant. Main characters fight to prevent some atrocities that keep happening. Pretty boys, inanimate objects holding real value, pretty similar overall 

Seems to be to the same demographic. Attractive art, interesting concept, but the plot is not too heavy/too cliff-hangery. A good light watch for some pretty faces. MC is on the bubblier, airhead side but it's nothing unbearable. Great seiyuus too 

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.