MarketBackstabbed in a Backwater Dungeon
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Backstabbed in a Backwater Dungeon

Backstabbed in a Backwater Dungeon: My Trusted Companions Tried to Kill Me, but Thanks to the Gift of an Unlimited Gacha I Got LVL 9999 Friends and Am Out for Revenge on My Former Party Members and the World is a Japanese light novel series written by Shisui Meikyō and illustrated by tef. The series started serialization on the online platform Shōsetsuka ni Narō in April 2020, and was later acquired by Hobby Japan for a print release in May 2021, with a manga adaptation by Takafumi Ōmae being published by Kodansha since May 2021. Both series were licensed for an English-language release, with J-Novel Club publishing the light novel series and Seven Seas Entertainment publishing the manga series. An anime television series adaptation produced by J.C.Staff aired from October to December 2025.

Premise
The world is inhabited by nine tribes: dragonutes, demons, oni, dwarves, elves and dark elves, beast men, centaurs, and humans, with the last ones being the weakest of all. Despite this, there are humans who receive a special power, known as a "gift", once they reach the age of 10. Light is a human adventurer bestowed with the gift of "unlimited gacha", allowing him to summon an endless number of cards to support his comrades. He is a member of the Concord of the Tribes, an adventurer group consisting of the dragonute Drago, the elf Sasha, the dark elf Sionne, beast man Garou, the dwarf Naano, the centaur Santor, the ghoul Oboro, and Diablo from the demon race. The group was seemingly formed to fight against the discrimination against humanity. One day, when Light had to be saved in the world's most dangerous dungeon, known as the "Abyss", the members revealed to Light that he was no longer a member of the adventurers group and the sole purpose of the group was to observe him for being a potential "master" candidate. It is said that the master is a being with the power of overruling the world and destroying civilization. As Light only was able to summon useless cards they decided to classify him not as a threat, to get rid of him and disguise his death as a monster attack. Before Garou was able to deliver the final blow Light managed to activate a teleportation trap by accident, which transported him to the deepest part of the dungeon. As his wounds attracted the attention of numerous monsters he used his gift out of desperation in the hope of summoning something to distract the monsters. He summons the seeker maid Mei, a SUR card, who is able to defeat the monsters with only one blow. Mei reveals to Light that he was able to summon her due to the density of magic in this place and that his summons until now were useless because of the lack of magic on the surface. He responds to her question about how he was able to reach the deepest part of the dungeon to summon her, retelling his story of how he was betrayed and nearly killed by his former comrades. Hearing this, Mei offered to support him in his plans to take revenge on those who betrayed him. For the next three years, Light spends his time and power building an underground base in the Abyss, and decides to return to the surface of the world to start his revenge against his former comrades. When he visits his hometown he learns that it was completely destroyed and its people were massacred, including his parents. He witnessed other races enslaving humans, using them in horrendous experiments or killing them just for fun. So, Light decides to enlarge his revenge to all the other races to free all the humans from enslavement and discrimination as well as to search for his siblings, who have seemingly survived the attack on his former hometown. ==Characters==
Characters
Main characters ; : : A 12-year-old human boy with gift of "unlimited gacha" which allows him to summon endless amounts of cards for support. He was a member of an adventurer group called the Concord of the Tribes. : One day while investigating the world's most dangerous dungeon called the "Abyss" he was kicked out of the group and revealed that his comrades were observing him and his gift for being a potential "master" candidate by the order of their kingdoms. : His hometown was destroyed while Light was absent. His siblings seemed to have survived the attack, so Light has multiple goals to achieve: Searching for his lost siblings, revenge against his former comrades and finding the truth behind the reason for his attempted murder. Summoned card characters SUR cards Lvl. 9999 ; : : SUR card . She is the first SUR card Light has summoned. She has long, black hair which is tied into a ponytail. Mei is Light's maid and has sworn her loyalty to him. : In the beginning, Mei had trained Light so he was able to raise his own Lvl to 9999 even though it is thought that the level cap for humans was about 100. ; : : SUR card . Aoyuki is the second SUR card summoned by Light. She has a childlike figure and blue hair. Aoyuki wears a hoodie with cat ears. She loves acting like a cat, being treated as a cat, and speaks in either meows or cat puns. As her name suggests, Aoyuki is capable of controlling monsters regardless of their levels and quantity. ; : : SUR card . A beautiful woman with long, blonde hair wearing a witch hat. Ellie is the third SUR card which was summoned by Light's gift. : As her title suggests, as a forbidden witch Ellie has mastered magic, wizardry, the dark arts and ghost magic. Ellie is capable of creating new spells and to suppress the magic of her opponents. Under an alias she lives part time in "the Giant Tower" pretending to be the leader of her faction for discretion from Light's enemies that are on hold! ; : : SUR card . Nazuna is a beautiful young girl with fire-red eyes and long, silver-colored hair. She wears heavy armor and is rumoured to be the strongest warrior in the world. In battle she mostly uses a broadsword which is taller than Nazuna herself. : Nazuna is the fourth and last SUR card summoned by Light which is why she is treated like a daughter by the others. Her unique figure is that she is a half vampire with the strength of pureblood, however she does not nor need to drink the blood of others. She is very immature and light harted and can easily startled when those above her, like Ellie scold her. Currently when she is not sent on a mission on the surface, she is assigned to be Yume's bodyguard. UR cards Lvl. 7777 ; : : UR card . A young girl with violet-colored eyes and short, black hair. She is a gunner carrying a talking musket called "Lock" with her. : As Suzu is a timid and silent person, Lock is the one communicating with others on her behalf. In the English dub, Lock speaks with an American Southern accent. However, when provoked, namely by someone insulting Light, she becomes incredibly bloodthirsty and unreasonable. ; : : UR card . A tall woman with red-colored eyes and jagged teeth. She is a chimera whose body consists of countless other creatures. Mera can cut off parts of her body and put them back together. ; : : UR card . A young woman with two-colored hair (red and light blue) which are tied to twintails. As her name suggests, she has high affinity using fire and ice magic. She is capable of summoning mythical beasts like Ifrit. : She is trained by Mei to be a maid which is why she sometimes wears a maid dress. ; : : UR card . A muscular young man with green eyes, brown-blonde hair and beard roots. Proud of his strength he fights his opponents with his fists instead of using a weapon. He can envelop his body in a suit of material which is stronger than steel. :Jack sees Light as his younger brother and vows to protect him, and in this Light allows jack to address him to him without formals and among the URs is Lights lone left hand man! Lvl. 5000 ; : : UR card . A warrior wearing a golden armor. Together with Light, who disguised his identity using the pseudonym "Dark" and the assassin Nemumu, Gold forms the adventurer party called the "Masked Clown". : Gold is loyal towards Light and shares his knowledge as a warrior with other adventurers. He and Nemumu tease each other on a regular basis. Giving the impression that Gold and Nemumu can't stand each other, despite this Gold cares for his companions. Gold speaks with a British accent. ; : : UR card . A young woman with short, white hair. As an assassin, Nemumu is capable in sneaking up towards her opponents without being noticed. She has high affinity in using knives and creating the strongest poisons. She can inculcate her surroundings by using a scream in ultrasound range. : Together with Light and Gold she is part of "The Masked Clown" adventurer group which was formed to investigate the surface of the world and the other races in search for clues about the "master". Like Gold, Nemumu is loyal towards Light which she shows by kissing his feet even to his embarrassment. She is often teased by Gold for her figure. ; Lvl. 8888 ; :Chaos is a prideful warrior with the appearance of a young boy who only recognizes and respects those stronger than him. He refuses to follow Light's orders at first but submits after being defeated in combat by him. Since then he acts as one of Light's commanders and occasionally, as his body double because they have a similar height and physical appearance. ; :Orca is a bard who dislikes violence and fights by playing his violin, which is capable to power up allies and weaken opponents. Concord of the Tribes ; : : A warrior from the race of dragonutes. His level is 512. Drago is the leader of the adventurer group Concord of the Tribes which Light was part of. Even when he looks like a prudent and friendly person, Drago was the one who ordered the others to kill Light and disguise the murder as a monster attack. ; : : An archer from the elven tribe. Her level is 308. She was born as a result of an affair between a nobleman and a commoner which is why she was disowned by her family. : She seemingly had feelings for Light which turned out to be a lie which is why the other members of the Concord of the Tribes mocked her. : After seemingly killing Light and her engagement with a high-ranked elf her reputation within her race and family increased. When she learned that Light was still alive she tried to kill him in order to keep her reputation. Instead she was captured by Light, after she failed to kill him. In reality, Garou is a coward and would betray his own friends in order to survive. As his tribe is one of the weakest (second only to humans), he has no information regarding the mission of the Concord of the Tribes or about the master. His level is 301. Due to his fame he was chosen by the dwarven king to join the Concord of the Tribes to observe Light and his gift. : After the mission was accomplished, Nano became addicted to alcohol because he failed to reach his own goal and was denied a second chance to look for the "master" which he blamed Light for. : Naano tests his forged weapons on humans. One day he received an instruction Manual for smithing a holy weapon by a mysterious merchant. ; : : A warrior from the centaur tribe whose level is at 152. His character was added in the manga. ; : : A oni warrior at level 419. He is the second strongest member of the Concord of the Tribes right after Drago. ; : : A fighter from the demon race who is at level 403. His character was added in the manga. C's Group C is a mysterious being that made themselves known while Light was dealing with Naano. Not much is known about C, except they know about Light's quest for vengeance, and has an incarnated form of giant devouring dragon's head, due to an ancient religious painting. Later on it is revealed that the dragon like creature was a servant of C, while C's form was a young woman riding the creature. It's implied by Kaava that the other masters are either searching for or working against C. ; Kaava: Known as the Level 5000 Flesh Zombie, Kaava is a human with the ability to boost his abilities by eating human flesh. It was revealed later on that he was actually created by a master known as Hisomi merging various humans together. ==Media==
Media
Light novels Written by Shisui Meikyō, the series began as a web novel with its chapters first published on Shōsetsuka ni Narō on April 17, 2020. Japanese publisher Hobby Japan acquired the rights for a print release of the series and started publishing the novel under their HJ Novels imprint. The light novel, written by Meikyō and illustrated by tef, was published in physical format with the first volume released on May 19, 2021. The first volume of the manga was released in print on August 6, 2021, in format. As of February 2026, twenty-one volumes have been released. which was later revealed to be a television series that is produced by J.C.Staff and directed by Katsushi Sakurabi, with series composition and scripts written by Hiroshi Ōnogi, characters designed by Yukie Suzuki, and music composed by Ryo Takahashi. The series aired from October 3 to December 19, 2025, on Tokyo MX and other networks. The opening theme song is , performed by Tei, while the ending theme song is , performed by Nowlu. Sentai Filmworks licensed the series in North America, Australia and British Isles for streaming on Hidive under the title ''My Gift Lvl 9999 Unlimited Gacha: Backstabbed in a Backwater Dungeon, I'm Out for Revenge!''. Muse Communication licensed the series in South and Southeast Asia. Episodes }} ==Notes==
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