One.

"This wasn't supposed to happen."

HsDxD: A Silent Requiem is a "what-if" story that portrays a different version of the climax between Issei and Riser Phenex while completely diverging from the main plot. In this story, many new elements will make their appearance while the tone will gradually get darker and darker.

Since this is a DxD story, it will be rated R, so if you don't want to read nasty things, you have been warned.

All credits goes to Ichiei Ishibumi and Miyama-Zero for the story and the art.