In a world called Library filled with countless stories, the Characters within each story wish to revive their author for their desired future. To do so, they work together to gather inochi and fight the Nightmares that devour stories, knowing they will inevitably have to kill each other to get their wish.
The gameplay uses a real-time RPG battle system.
Notably Taro Yoko, known for his work on the Drakengard franchise and its spinoff series NieR, is the writer and creative director of this game, though there is no apparent connection between this game and his other works besides the crossover collaboration events held for this game. The Reality Arc and the Drakengard 3 collaboration connect both series to the mysterious world of Library.
The game was originally slated for a global release on July 18th, 2019, but was delayed two days prior to an unknown date.
A Manga serialization began release in 2019.
Tropes that appear in this game:
- Alas, Poor Villain: Most of the sentient Nightmares qualify; most of them just want to be left alone or achieve their dreams, only to be slaughtered by the characters.
- Ambiguously Human: Pinocchio is a doll turned human who struggles to make a decision on his own, relying instead on others to give him orders. In Book One Chapter 4, Pinocchio realizes that he doesn't remember becoming a real little boy while his staff exhibits all traits associated to his doll self (foul mouthed, mean, nose growing when lying). Pinocchio's concept art hint at the fact that the staff might be the real Pinocchio.
- Apocalyptic Log: Some of the weapon stories and event stories describe the last moments of their previous owners/narrators.
- Author Avatar: Invoked. The character whom you choose as your main set is the one to represent you, the players, when controlled by the AI or in your friends' list. Otherwise it's averted, since the players play no role in the story outside interacting with Anki and Gishin.
- Ax-Crazy: The whole cast really. Special mention goes to Little Red Riding Hood who is associated with Violence itself.
- Be Careful What You Wish For: A common theme among the weapon stories as well as the main story. Most of those who make a wish wind up Blessed with Suck or in a Ironic Hell. Said wish can also lead to being turned into a Nightmare as revealed in Book Two and is the cause behind the event Avatar of Envy.
- The Caligula: What Cinderella wishes to become by reviving her Author to make him rewrite her story.
- The Corruption: The Nightmares, the main antagonist force through the game, who roam the Library, consuming the stories contained within. They come in various shapes and sizes, based upon monsters found in fairy tales and myths, including the characters. While they usually act as mindless mooks, some of them have shown the ability to speak. Book Two and some events explained the reason why: Nightmares are formed from human beings
- Creepy Doll: Anki and Gishin, the two Obviously Evil puppets who act as the characters' guide in the Library. Both look like young children but are foul mouthed. They enjoy the misery of others, often taunting characters over their doubts as well as encouraging them to mercilessly kill any Nightmares they came across. They are also the ones in charge of the gacha.
- Crossover: It has a collaboration event with another Yoko Taro work, NieR: Automata, focusing on the amusement park boss. 2B, 9S, A2, Emil, and several weapons from the game also make an appearance in this crossover. Another crossover with Drakengard 3 featured Zero, One, Accord and Mikhael in human and dragon form, as well as some enemies from that franchise like the Intoners turned into Nightmares.
- Cute and Psycho: Most of the cast can be qualified as such, in particular characters like Little Red Riding Hood, Briar Rose or Gretel.
- Darker and Edgier: The characters are a far cry to the stories they originated from. A jarring one is Gretel carrying around the severed head of Hansel in a bird cage blaming the witch as his killer. Her cross episode with Cinderella and her job story implies she was the one responsible for Hansel's death. Then Book two, Chapter three of Gretel's story reveals that Gretel was actually Hansel all along.
- Driven to Suicide: Implied all over the place, from weapon descriptions to character backstories, The Little Mermaid being an example, to certain characters' Reality Arcs.
- Fairytale Motifs: Each character comes from a fairy tale and makes reference to the stories they originated from.
- Foreshadowing: Gretel's voice, while creepy, actually sounds more close to a male than a female. Book two, Chapter three of Gretel's story reveals that the Gretel the player knew is actually Hansel and the disembodied severed head is Gretel's.
- Gotta Kill Them All: The only way the characters can have their wish granted and have their Authors brought back to life is by collecting Inochi. Said Inochi can only be collected by killing beings that have been granted life through stories, which includes Nightmares and the Characters.
- Great Big Library of Everything: The world of Library is this. A place where countless stories can be found, from famous literature works to fairytales, including tales from unknown worlds. The appearance of the Library changes depending on the viewer, in the case of the players, it manifests as a giant library filled with books. Said books are used like Portal Book to travel to a world or are used to summon a weapon from one for the gatcha.
- Incorruptible Pure Pureness: Subverted with Snow White. While her wish is to remain pure and just, Snow White acts like a Knight Templar who use her Justice as a way to justify her crimes. The blood stain found on her white dress, that is present on all her job classes, symbolizes her sin. Her Breaker job story implies the blood is either the prince's who took a fatal blow for her or her mother's whom she killed in retribution.
- Job System: Each character can switch between jobs, which like weapons when levelled will tell a story relevant to the character.
- Little Dead Riding Hood: Inverted with Little Red Riding Hood. Instead, anyone who come across her is the one whose life is at risk.
- Little Red Fighting Hood: Little Red Riding Hood is a Little Miss Badass with Ax-Crazy tendencies.
- Living Weapon: A few of those are mentioned in various weapon stories, the most prominent one being Pinocchio's staff, who has an actual face and his own will, often dragging Pinocchio around in order to kills any nightmares meeting their paths. Oddly enough, the staff turns silent when Pinocchio is not alone. The staff is implied to be the real Pinocchio and the culprit behind the disappearance of Geppetto and other people related to the puppet.
- Mad Scientist: Dorothy from The Wonderful Wizard of Oz. Her introduction PV has her voice excitement over the thought of collecting new samples in Library. Her wish is to put her Author's brain in formaldehyde. Her weapon story has her test a drug of her own creation on living beings with the expected effect. Her Gunner job story implies she used the cast of Wizard of Oz as her first test subjects.
- The Reveal: The Library is a by-product of the Cataclysm mentioned in Drakengard 3.
- Story Arc: So far there are three books; Impulse Arc, Hatred Arc and the Reality Arc. A fourth arc called the Fusion Arc was eventually added in 2019.
- Tomato in the Mirror: What Gretel's character arc turned into. Gretel comes to a realization that Gretel is actually Hansel and the head in the cage is Gretel.
- What the Hell, Hero?: Throughout story mode and job stories, the Characters will perform some questionable deeds that Anki and Gishin gleefully taunt them over with. During cross episodes, Characters call their partners out on their mindsets and actions throughout their inner monologue at the start of each stage. Starting Book Two, Nightmares do the same towards their would-be executioners.