The main promotional trailer for the TV anime 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 has dropped, plunging viewers into a gritty tale of betrayal and retribution. The trailer offers a thrilling glimpse into the series' intense world of betrayal, revenge, and overpowered abilities, while previewing the opening theme song Sen yori Kaminari ya, Sarari ya Takaki performed by singer-songwriter Tei.
The trailer highlights key moments from the story, showcasing the protagonist Light's descent into despair and his subsequent rise to power through his unique "Unlimited Gacha" gift. It features dynamic animation sequences, character introductions, and high-stakes action set against the backdrop of treacherous dungeons and fantastical realms. Accompanying these visuals is a preview of Tei's electrifying opening track, which captures the themes of resilience and vengeance with its powerful lyrics and composition—all crafted by Tei herself. The song is slated for a digital release on October 3, 2025, at midnight, coinciding with the anime's premiere.
Tei, known for her work as a mini-harp singer-songwriter under the name Tei Hinoto and as an anime song artist, expressed her deep connection to the series in a statement:
As I read through the story, I struggled deeply with how to confront the tenacity and desire for revenge of the protagonist, Light, who crawls out from a position of being scorned and powerless to do anything. At the same time, I also had to confront the dark emotion of revenge inside me. I felt that this work needed the strength to guide rather than just empathize, so I am putting my heart and soul into this challenge. I hope that this song will deepen and strengthen the core of the story.
The anime is set to premiere on October 3, 2025, airing on TOKYO MX every Friday at 23:30, MBS at 26:23, CBC at 26:23, BS11 every Sunday at 23:30 starting October 5, and AT-X every Saturday at 23:30 starting October 4, with repeat broadcasts available. Produced by J.C.Staff, the series boasts a talented voice cast, including Jin Tamaki as Light, Ikumi Hasegawa as Mei, Hana Hishikawa as Nazuna, Shiori Izawa as Aoyuki, Ayumi Mano as Ellie, Yuko Natsuyoshi as Nemmu, and Katsuya Miyamoto as Gold.
Behind the scenes, the production is helmed by director Katsushi Sakurabi, with series composition and scripts by Hiroshi Onogi. Character designs are handled by Yukie Suzuki, based on original illustrations by Tef. The art direction is by Yukiko Ashino of Studio Churippu, color design by Tomomi Ando, cinematography by Shingo Fukuyo, editing by Maki Sento of REAL-T, sound direction by Miwako Iwanami, sound effects by Kyosei Koyama, and music composed by Ryo Takahashi, with music production by Lantis.
Here is the key visual for Backstabbed in a Backwater Dungeon anime:
What 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 About
The anime is an adaptation of the 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 light novel series written by Meikyuu Shisui and illustrated by Tef. It originated as a web novel on the user-generated platform Shōsetsuka ni Narō in April 2020, where it gained popularity for its blend of isekai elements, revenge fantasy, and gacha mechanics. The series was subsequently picked up by publisher Hobby Japan, which began releasing it under their HJ Novels imprint in May 2021. To date, it has spawned multiple volumes, with a manga adaptation by Takashi Omae running in Kodansha's digital magazine Magazine Pocket since 2021.
The story follows Light, a human adventurer in a world dominated by stronger races, who faces ultimate betrayal from his trusted party members. Surviving against all odds, he unlocks the true potential of his seemingly useless skill, leading to an epic tale of empowerment and retribution. As described by English publisher J-Novel Club:
When Light is kicked out of the Concord of the Tribes, his former comrades instantly turn on him. Light escapes this diabolical act of betrayal by the skin of his teeth...only to find himself in the deepest part of the Abyss, the most dangerous dungeon in the realm! To avoid being eaten by carnivorous monsters, he uses the Unlimited Gacha, his sole magical skill. But where it previously only produced junk items, this time Mei—a gorgeous Level 9999 fighter in a maid outfit—springs forth! Fast forward three years and Light has carved out his own kingdom in this backwater dungeon, summoning more beautiful Level 9999 warriors who swear absolute fealty to him. Now a powerful Level 9999 Overlord himself, Light plans to ascend to the surface and take revenge on his betrayers one by one!
With its themes of overcoming adversity and exacting justice, the series promises a gripping narrative for fans of action-packed fantasy adventures. As the premiere approaches, anticipation builds for how this revenge saga will unfold on screen.
Sources: Official website and X account of Backstabbed in a Backwater Dungeon anime
