Serel, a young boy living in the capital, calls himself just a librarian.
He works at the Royal Magical Library, where he spends his days organizing, reading, and spending time with books.... more>>

As a librarian, he thinks he's busy, but he's having fun, and he's doing his job just fine, but apparently the people around him think differently.

In the first place, it is abnormal to be the sole librarian of this huge library.
He has a huge amount of knowledge and is a living textbook.
I'm sure you'll agree with me.

I've been told that I'm the only court librarian in the capital, and I've been told this by people who have come to the library.
‘I'm just doing my job as normal’, I thought, as I went about my day at the library. <<less

Resident no. 233, a frustrated novel villain of the City of Sin had a hard life due to his fondness in acting like a protagonist in each parallel world he enters. The measly sin points he earned wasn’t even enough to fill his belly.... more>>

Having enough of begging in the streets of the city where villains like him lived, he stood up with a determined face and promised to stick to his villainous roles to earn more sin points and live a decent life!

But just as he was rebuilding himself, he met Lily, a one-of-a kind heroine who seeks revenge for the death of a protagonist killed in cold blood by Wei Batian, another villain.

Lily mistakenly thought that 233 was also a righteous martial artist like her, so she came to him and offered a proposal.

“Please Mister! You have to help me! As righteous martial artists, we have to find and kill Wei Batian!”

This is f*cking embarrassing… <<less

When hunters enter the dungeon, I fall into a dream.

In the year 1989, the Japanese government passed the Media Betterment Act, allowing a group of soldiers known as the Media Betterment Committee (MBC) to destroy and censor any "problematic" media under the guise of protecting public morals. As a response, regional governments established the Library Defense Force (LDF), whose members take up arms and put their lives on the line to protect freedom of expression. At the top of the Kanto branch of the LDF stands the Library Task Force (LTF): an elite squad consisting of only the most exceptional fighters.... more>>

As a high schooler, Iku Kasahara experienced the terror of censorship first-hand when she refused to surrender the newest volume of her favorite series to MBC agents. She only came out unscathed thanks to a lone member of the LDF, who protected her and her beloved book. Now in her 20s and still unable to forget the man who saved her, Kasahara joins the LDF in the hope of becoming just like her prince.

But LDF training turns out to be far more rigorous than she could have imagined, and her instructor, LTF member Atsushi Doujou, seems fixated on making her life a living hell. Given her struggles, Kasahara is shocked when she is selected as one of the two new LTF recruits as a result of Doujou's recommendation. As Kasahara does all she can to become worthy of the LTF and unravel her enigmatic superior's motivations, she wages war—both on the battlefield and in her personal life.

Vol 1 – Toshokan Sensou (図書館戦争) (Library War)
Vol 2 – Toshokan Nairan (図書館内乱) (Library Infighting)
Vol 3 – Toshokan Kiki (図書館危機) (Library Crisis)
Vol 4 – Toshokan Kakumei (図書館革命) (Library Revolution) <<less