"My blood is a blasphemy that the gods fear and demons despise."
Arata Sparda should not exist. He is the dirtiest secret of the Underworld: the bastard son of Sirzechs Lucifer and the granddaughter of the legendary Dark Knight, Sparda. Disowned by his father and abandoned after the tragic death of his mother in poverty, Arata grew up with a heart of ice hidden behind the mocking smile of his grandfather Dante and the icy gaze of his uncle Vergil.
At 17, after surviving a brutal invasion by the legions of Mundus and regaining his memories as the "Demon King Candidate," Arata achieves the impossible: he wounds the King of the Underworld. But the price was high. With his powers sealed and his body at its limit, he awakens with an artifact linked to his soul: The Diary of Destiny.
Following a mysterious invitation, Arata infiltrates the Bible Academy, home of the Trinity Seven. His goal is cold and calculated: to master the Seven Deadly Sins, awaken his Sparda heritage, and use the most powerful magicians as pawns for his true mission: the fall of the Gremory Clan and the execution of Sirzechs Lucifer.
What Arata doesn't know is that his diary is not private.
Durch eine Seelenverbindung können die Frauen, die sein Leben prägen werden – von der strengen Lilith Asami und der neugierigen Rias Gremory bis hin zu den unerbittlichen Lady und Trish – jeden seiner Einträge lesen. Während Arata über seine Eroberungspläne und seine Verachtung für die Welt schreibt, entdecken sie die herzzerreißende Wahrheit: das Trauma eines verlassenen Kindes und die Last von drei Welten (DxD, DMC und Trinity Seven), die auf seinen Schultern lasten.
Werden sie das Monster aufhalten können, das die Nachlässigkeit der Götter geschaffen hat, oder werden sie von der Rebellion des Bastardkönigs mitgerissen werden?