The highly anticipated anime adaptation of Shisui Meikyou and tef’s light novel series, 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 officially set to premiere on October 3, 2025. Bandai Namco Filmworks recently unveiled a new key visual, along with a host of additional cast members and production staff for the upcoming television series.
Premiere Date and Channels
The Backstabbed in a Backwater Dungeon anime will begin its broadcast on October 3, 2025. Viewers in Japan can catch the series on Tokyo MX, MBS, and BS11 channels. An advance screening of the first three episodes is also scheduled for September 7 at Shinjuku Piccadilly Cinema.
Expanding the Voice Cast
The new announcement builds upon the previously revealed main cast members. Nina Tamaki is confirmed to voice the protagonist, Light, while Ikumi Hasegawa will voice Mei.
The newly announced cast members include:
- Hana Hishikawa as Nazuna
- Shiori Izawa as Aoyuki
- Ayumi Mano as Ellie
- Yūko Natsuyoshi as Nemumu
- Katsuya Miyamoto as Gold
Key Production Staff Revealed
J.C.Staff is handling the animation production for the series. Katsushi Sakurabi (known for Flying Witch and The Betrayal Knows My Name) is directing the anime. Hiroshi Onogi (Fullmetal Alchemist: Brotherhood) is in charge of series composition. Character designs are being handled by Yukie Suzuki (TSUKIMICHI -Moonlit Fantasy-). Ryo Takahashi (WIND BREAKER) is composing the music.
Further additions to the staff include:
- Art Director: Yukiko Ashino (Studio Tulip)
- Color Design: Tomomi Andō
- Compositing Director of Photography: Shingo Fukuyo
- Editing: Maki Sendo (REAL-T)
- Sound Effects: Yasumasa Koyama
- Music Production: Lantis
- Sound Director: Yoshikazu Iwanami
The Premise of Backstabbed in a Backwater Dungeon
The anime adapts the popular light novel series, which began serialization on the online platform Shōsetsuka ni Narō in April 2020. Hobby Japan later acquired it for print release in May 2021. J-Novel Club publishes the light novel series in English, while Seven Seas Entertainment handles the English release of the manga adaptation by Takafumi Ōmae.
The story follows Light, a human adventurer who is betrayed by his trusted companions and left for dead in the deepest part of the Abyss, a perilous dungeon. Surviving by sheer luck, Light utilizes his unique skill, “Unlimited Gacha.” This ability, which previously only produced junk, now summons powerful Level 9999 warriors, including the fighter Mei. Three years later, Light has established his own kingdom within the dungeon, surrounded by loyal and powerful allies. Now a formidable Level 9999 Overlord, Light plans to ascend to the surface and exact his revenge on those who betrayed him. The series promises a blend of fantasy, betrayal, and revenge, exploring themes of trauma and retribution.
