Chainsaw Man. Vol. 8. Spoiler

Aza Mitaki's previous life is behind her: just yesterday, she was an ordinary schoolgirl, and today she has been caught up in a conflict with powerful demonic beings. Now Aza shares her body with Yor, the war demon, and the only way to get rid of the unwanted companion is to help her defeat the Chainsaw Man. However, it seems that this won't be so easy... Meanwhile, Denji continues to carefree spend time and enjoy the increased attention to his alter ego, not even knowing that a deadly danger looms over him. The book includes the 13th volume of the manga (chapters 104–112).