No premiere date or PV released yet. This was posted to the publisher’s twitter account. Synopsis of the source light novels from AniList:
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!
It’s funny because you can tell when an anime is from a Japanese light novel or not based on the length of the title.
Solo-Leveling: Korean Light Novel
True Beauty: Korean Webtoon
Blue Lock: Japanese Manga
A Sign of Affection: Japanese Manga
Oshi No Ko: Japanese Manga
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: Japanese Light Novel
Banished from the Hero’s Party, I Decided to Live a Quiet Life in the Countryside: Japanese Light Novel
My Instant Death Ability Is So Overpowered, No One in This Other World Stands a Chance Against Me!: Japanese Light Novel
IIRC it’s because the dominant Japanese light novel website doesn’t do descriptions well so the authors make the title the description.
A few tried to have a normal title AND a description in the title.
Failure Frame: I Became the Strongest and Annihilated Everything With Low-Level Spells: Japanese Light Novel
Arifureta: From Commonplace to World’s Strongest: Japanese Light Novel