Shu's sister, Kanna, whom he has been desperately trying to save, is revealed to be a half-demon.

The person Shu trusted most in the world, his foster father and mentor Miles, is revealed to be the Demon Agent.

Watch the official English dubbed stream of this tragic confrontation on Crunchyroll:

This episode highlights the darker side of Shu and Kisara's contract. Shu is not just paying with memories; he is actively manipulating his own psyche to turn himself into a remorseless killing machine. By deleting his affection for Miles, he effectively erases the pain of betrayal at the cost of losing a piece of his own humanity. Leaving himself with a memento-style note written on his hand acts as a grim reminder that he is willing to hollow himself out to achieve his goals.

In a classic, tragic twist, Miles didn't betray Shu out of malice. He sold his soul to Asmodeus to save his own dying daughter.

Beyond the fight with Miles, the episode drops several bombshells that reframe the entire plot of the show:

Overwhelmed with rage and grief, Shu chooses to weaponize his memories in the most tragic way possible. He offers up every single memory of Miles to Kisara as fuel, completely erasing his love and bond with his foster father so he can kill him without hesitation. 📜 Massive Lore Reveals

This episode completely shatters the status quo by delivering heartbreaking betrayals, brutal sacrifices, and massive lore drops regarding Shu's family. 💔 The Ultimate Betrayal