Cassimir was born in Poland to ghoul parents. In their attempt to keep him safe, they homeschooled him and kept him inside as much as possible for fear of being found out. Because of this, they spoiled the boy as much as possible and coddled him at every given chance. Cas' parents were his best friends and his whole world.


When his teenage years hit and his hormones were going wild, he wanted to leave the house more. His parents refused and in turn, Cas started to rebel. One of which way was starving himself. Starvation and anger got the best of him and he lost control during an argument with his parents, killing them. Thus, starting his spiral into his own personal hell.


Fleeing his home, he made his way across the continents until he eventually reached Japan. The country was at war with the Ghouls more so than anywhere else, not to mention the Ghouls there seemed to have more of a system for their territories. So, he laid low and attempted to blend in with the humans despite hating every second of it. The doves deemed him The Plague due to his sickly look and his lack of an intricate mask, only donning a basic face mask instead.