Engage Kiss Episode 9 -

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. Engage Kiss Episode 9

Shu's sister, Kanna, whom he has been desperately trying to save, is revealed to be a half-demon. This episode highlights the darker side of Shu

The big bad demon pulling the strings is Asmodeus, who is tied directly to Shu's mother. Leaving himself with a memento-style note written on