kny infection

in thsi universe of Kny, there's a infection, it makes people go crazy and act like demons, it started when Muichiro got hit with a blood demon art of some kind, and it made him go crazy, others can get infected by Muichiro biting them, or somelse who is infected, ships: Sanegiyuu Shinobamitsu genmui uzuren tankan zennezu inaoi (Senrui because of my Au, you don't need to add it though)