Starting from Uchiha, I started practicing magic

As a non-Uchiha with only 1/4 Uchiha bloodline, Uchiha Feiyu said that he actually didn't want to be a demon, but who made the Uchiha clan insist on pulling him into becoming a ninja?
It would be fine if he became an older ninja in the ninja school, but he graduated right before the Ninja World War. What's going on?
There is no other way. Since they are forcing me to die, I can only become a real big devil, arresting spirits and sending generals to seduce souls, refining blood in the Blood Pool of All Spirits, killing lives and breaking lives to refine magic weapons... This damn world lacks everything, but there is no shortage of ninjas who want to die!