Takes place in the Junkyard, a combat simulator program divided between six tribes where it always rains: the Embryon, Vanguards, Solids, Maribel, Brutes and Wolves. Each tribe holds a particular territory, and initially are devoid of emotions. The main protagonists are a silent protagonist like other SMT Series, his name is Serph the Leader of Embryon. After being infected with a demon virus that grants them demonic powers, the Embryon must fight with and devour the other tribes. The following game is set on Earth, which has been devastated by a phenomenon known as the “Black Sun”, a manifestation of God’s anger. The survivors of humanity are ruled by the Karma Society.