From Viz: Delve into the tortured past of Earl Cain C. Hargreaves, charismatic heir to a wealthy family full of secrets, lies and unthinkable crimes. The prequel to the Godchild series, The Cain Saga follows the young Cain as he attempts to unravel the secrets of his birth, all the while solving each new mystery that comes his way.

The story revolves around a high school girl named Stella who was born into the wealthy Kuonji family. Every month, the family holds an event called the Tea Party. An incident occurs as all the siblings are gathered this time. Someone says, "Starting now, everyone will kill each other. The person left alive will become the head of the family." Stella's killing game begins.