A human youth named Ethan Voss transmigrates to the Seven Sins Abyss sealed by the gods, reborn as a one-year-old infant, and is discovered by three succubus sisters who bring him back to the Succubus Clan. In a critical moment, Ethan awakens the Abyss Sovereign System, grows rapidly under the doting adoration of the succubi, and shoulders the mission of leading the Succubus Clan out of the abyss to fight against the Alliance of All Races. A brand new journey is about to begin.