Backstabbed in a Backwater Dungeon / Shinjiteita Nakamatachi ni Dungeon Okuchi de Korosarekaketa ga Gift "Mugen Gacha" de Level 9999 no Nakamatachi wo Te ni Irete Moto Party Member to Sekai ni Fukushuu & "Zamaa!" Shimasu! / 信じていた仲間達にダンジョン奥地で殺されかけたがギフト『無限ガチャ』でレベル９９９９の仲間達を手に入れて元パーティーメンバーと世界に復讐＆『ざまぁ！』します！ / Dibunuh oleh Teman Sendiri di Kedalaman Dungeon / Bị Phản Bội Bởi Đồng Đội Và Sở Hữu [Gacha Không Giới Hạn] Lv.9999 / Balas Dendam Gacha Tak Terbatas

My Gift LVL 9999 Unlimited Gacha (commonly known in English publishing as Backstabbed in a Backwater Dungeon) is a top-tier masterpiece of the "Dark Fantasy" and "Gacha-System" genres, celebrated across the global manga community for delivering one of the most intense, grand, and immensely satisfying revenge stories ("Zamaa") in modern fantasy. Adapted from the massively popular light novel series by Meikyū Kingo, this manga has captivated millions of readers by executing the classic trope of brutal dungeon betrayal with an absurdly scale-breaking power twist. The series stands as a definitive standard for "Overpowered Vengeance," blending a human's absolute lowest rock-bottom with the pure catharsis of crushing his executioners using a max-level army.

The story follows Light, a human youth who joins a prestigious, multi-racial adventurer party named the "Gathering of Races." In a brutal fantasy world where humans are discarded as the weakest and most worthless race, Light is viciously betrayed by the comrades he trusted and cast away into the absolute lowest, uncharted depths of the Abyss—a legendary dungeon from which no human has ever escaped alive. At the brink of a agonizing death, Light activates his unique innate gift, Mugen Gacha (Infinite Gacha), which his party had mocked as useless trash. Through absolute, desperate luck, he pulls god-tier legendary cards that summon beautifully terrifying, fiercely loyal companions all locked at Level 9999 (starting with his elite demonic maid, Elle). Rising from the jaws of the underworld as the supreme ruler of the Abyss, Light begins a cold, meticulous campaign to systematically dismantle his former party members and the entire hypocritical world that spat on humanity.

Genres: Action, Adventure, Fantasy, Drama, Dark Fantasy, Shonen