The official website for the upcoming fall 2025 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 released a main trailer today. In addition to the character voices of Mei (CV: Ikumi Hasegawa), Nasuna (Hana Hishikawa), Aoyuki (Shiori Izawa), Ellie (Ayumi Mano), Nemumu (Yuko Natsuyoshi(, and Gold (KatusyaMiyamoto), the clip features the anime's opening theme song performed by singer-songwriter Tei. Backstabbed in a Backwater Dungeon Main Trailer Tei has been active under two names: mini-harp singer-songwriter Tei Hinoto, and anime song composer and singer Tei, Under the name Tei, they provided theme songs for Tsurune (2023), The Weakest Tamer Began a Journey to Pick Up Trash (2024), and Unnamed Memory (2024). Tei shared the following comment on the song, which will be available digitally on October 4: 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. Tei artist photo RELATED: Backstabbed in a Backwater Dungeon Anime Announces October 3 Premiere The TV anime adaptation of the fantasy 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 created by Shisui Meikyo (story) and tef (illustrations) is set to premiere in Japan on October 3, 2025. Katsushi Sakurabi ( Is It Wrong to Try to Pick Up Girls in a Dungeon?: Arrow of the Orion ) directs the anime at studio J.C.STAFF, with series composition by Hiroshi Onogi ( Fullmetal Alchemist: Brotherhood ), character designs by Yukie Suzuki ( TSUKIMICHI -Moonlit Fantasy- ) and music by Ryo Takahashi ( WIND BREAKER ). Yoshikazu Iwanami serves as sound director. J-Novel Club publishes an official English version of the light novels and describes the story as such: 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! Source: "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" anime official website / X (formerly Twitter)
