"Hey father, look at me." The world is Psychiatrist Levia Barisol is visited by a peculiar individual bringing along a woman called Nemesis Sudou, who is in a unresponsive, dazed state. In order to learn about Nemesis' past, Levia utilizes her specialty, the "Swap" technique, to relive her memories and past experiences... Based on the song of the same name released by mothy on Nico Nico Douga in August 8, 2014, representing the Sin of Wrath in mothy's "Seven Deadly Sins" series of songs, it told the story of the assassin Nemesis Sudou as she points the muzzle of her gun to USE Dark Star Bureau Director Gallerian Marlon, the man who was the corrupted "Master of the Court", the "Collector" of Vessels of Deadly Sins, boss of the armed organization PN... And also her own father. Before pulling the trigger, Nemesis offers Gallerian a last chance of atoning for his sins.

"We have done nothing but make mistakes." What does the boy see at the end of the never-ending cycle of death and rebirth? Thanks to the actions of Allen Avadonia, who once served under princess Riliane as the "Servant of Evil", Nemesis recovered her lost memories. As the sole survivor of the ruined world, she journeys with Allen to "Evils Theater" in order to uncover the "key" needed to save the devastated land.

The story follows Allen Avadonia after the annihilation of the Millennium Tree Forest by "Punishment", sent on a journey to meet the souls of individuals involved with the vessels of sin by Sickle.