Backstabbed in a Backwater Dungeon (2025): Cast, Plot, Release Date, Review & Where to Watch – Unlimited Gacha, Betrayal, and Revenge in the New Anime ⚔️🎴

Anime fans, get ready for one of the most brutal and twisted revenge sagas of the year. 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 (yes, the title is as wild as the premise!) is coming this fall. Produced by J.C.Staff, the anime adaptation of Shisui Meikyō’s hit light novel series will premiere on October 3, 2025, and stream on Hidive under the shortened English title: My Gift Lvl 9999 Unlimited Gacha: Backstabbed in a Backwater Dungeon, I’m Out for Revenge!

This is not your typical “isekai power fantasy.” It’s a tale of betrayal, blood-soaked vengeance, and an underdog turned Overlord.

🌌 The Premise: Betrayed, Banished, but Not Broken

In a world divided among nine tribes—from elves and dragons to demons and humans—the latter are considered the weakest. Light, a human adventurer, joined the “Gathering of Tribes” to fight for equality. But one fateful day, his so-called friends reveal the truth: they were only spying on him, and when he fails to show real strength, they decide to kill him in the Abyss, the world’s deadliest dungeon.

Just as death closes in, Light’s seemingly useless gift—Unlimited Gacha—saves him. From the cards emerges Mei, a Level 9999 Seeker Maid, whose overwhelming strength wipes out monsters with ease. For the first time, Light realizes his gift wasn’t worthless — it simply needed the magic density of the Abyss to awaken its true potential.

Fast forward three years: Light has forged his own kingdom in the shadows of the Abyss, surrounded by loyal Level 9999 allies, and risen to become a dreaded Overlord. Now, he ascends to the surface, not just to punish his treacherous party members but to unleash vengeance upon the entire world that oppressed humanity.

Or in Light’s chilling words: “If the world abandoned me, then I will burn the world in return.”

🔥 Main Characters

✦ Light (Voiced by Nina Tamaki)

The betrayed adventurer who becomes a Level 9999 Overlord thanks to Unlimited Gacha. Once naïve, now a calculating and merciless avenger.

✦ Mei (Voiced by Ikumi Hasegawa)

The Seeker Maid and Light’s first SUR summon. Beautiful, deadly, and loyal, she not only saves Light’s life but trains him to reach the impossible Level 9999.

✦ Aoyuki (Voiced by Shiori Izawa)

A genius beast tamer who can command monsters of any size or strength. Light’s second SUR card summon.

✦ Ellie (Voiced by Ayumi Mano)

The Forbidden Witch, master of arcane and forbidden magic. A key weapon in Light’s arsenal of revenge.

✦ Nazuna (Voiced by Hana Hishikawa)

The True Vampire Knight, clad in heavy armor and wielding a broadsword larger than herself. Rumored to be the strongest warrior in existence.

And of course, the former “allies” of the Gathering of Tribes — Draggo the dragonkin, Sasha the elf archer, Shion the researcher, and Garuu the cowardly beast-man — who all believe Light is long dead… until he returns.

🎬 Anime Adaptation Details

• Studio: J.C.Staff (Food Wars!, A Certain Magical Index)

• Director: Katsushi Sakurabi

• Series Composition: Hiroshi Ōnogi

• Character Designs: Yukie Suzuki

• Music: Ryo Takahashi (ACCA: 13, SK8 the Infinity)

• Premiere Date: October 3, 2025 (Tokyo MX and other networks)

• Streaming: HIDIVE (North America, UK, Australia), Muse Communication (Asia)

🎶 Theme Songs

• Opening Theme: “Sen Yori Kaminari Ya, Sarariya Takaki” by Tei

• Ending Theme: “Shirogarasu” by Nowlu

⚔️ Why Fans Are Hyped

• Dark Revenge Plot: Unlike many isekai or fantasy power-up stories, this one leans into the darker side of betrayal and retribution.

• Unlimited Gacha System: The ability to summon LVL 9999 warriors adds endless potential for epic battles and shocking reveals.

• Gothic Dungeon Vibes: With its Abyss setting, the show promises chilling atmospheres, monstrous enemies, and jaw-dropping fight sequences.

• Moral Dilemma: Is Light truly justified in his revenge? Or will he become the very monster he once despised?

📅 Release Information

• Title: Backstabbed in a Backwater Dungeon: My Trusted Companions Tried to Kill Me…

• English Title: My Gift Lvl 9999 Unlimited Gacha: Backstabbed in a Backwater Dungeon, I’m Out for Revenge!

• Release Date: October 3, 2025

• Where to Watch: HIDIVE (global), Muse Communication (Asia)

🌑 Final Thoughts

Backstabbed in a Backwater Dungeon is shaping up to be 2025’s dark horse anime hit. With its blend of gritty revenge storytelling, larger-than-life Level 9999 characters, and a protagonist who transforms from prey into predator, it promises to leave fans hooked from the very first episode.

As Mei ominously says: “For every betrayal, there is a reckoning.”

Get ready — because this fall, the Abyss will rise to the surface.