In an era when the world has fallen to ruin, humanity hides within four colossal circular walls—The Circle of Devourers: Sequence Awakening—battling to survive against alien monstrosities.

Lu Luo awakens here, confused and powerless, until a mysterious voice appears before his eyes:

> “You are weak and suffocating... Only Sequence S-11: Observer can save you.”



Armed with strange powers like the Devourer, Fusion, and Observer, Lu Luo begins a journey through a decaying world where humans, monsters, and sequences wage endless war.