A world heavily inspired by jujutsu kaisen with a power system that's pretty confusing

This book is about our main character named Tori a human that's half monster after he merged with the strongest monster of all named Yoru a monster stronger than everything his sensei Jin has gotten him and let's Tori decide to Die or Live until he eats the 8 souls

Tori has to eat the 8 souls of the level 8 monsters the strongest level and true monsters that will do anything to achieve there goal they want to kill Tori to gain his power and be the king of everything

He has watched his sister Sanya die from a heart problem and cancer and he knows he has to live on for his sister even if he knows he'll die at the end will he carry it out or will he break the deal?

Tropes/genre: fiction, dark, adventure, action, fantasy, sad, inspired by jujutsu kaisen, diseases, good characters, multiple arcs.

Tori is on the floor crying in pain yelling as it flashes through memories and someone is standing over him


Person: did you change because you lost your friend? Or did you lose your friend because you changed


The person laughs Tori looks at his enemy who is actually Xenia Tori yells in pain. And gets up and runs to Xenia one of the strongest level monsters or a Level 8 a memory flashes and it shows Gari sitting down on a bench and looking at Tori


The flashback ends as Tori gets hit in the face another memory flashes and it's it's Jin sorrounded by enemies


Tiyori is laughing and the flashback ends Tori is getting hit multiple times as he is punched by Xenia and Xenia punches Tori in the face then spin kicks him and switched into a backhand  another memory flashes and this time Jin is fighting someone he is scarred and bleeding badly


The flashback ends as Tori is angry as Xenia punches a hole in Tori's stomach he is bleeding badly as he is angry the scene turns black and white(to us)


Chapter 9 - Chapter 6: 2 years later...