HE∀DS - Vol. 1 Ch. 5 - "Motive"

[MangaDex]

 

[hirobran]

Why do I get the feeling that the culpret was the donor...

 

[Nezk1]

I feel like that he is going to have split personalities at some point

 

[Beregorn]

Let me take a wild guess: the brain he got was from the killer and we will have dr Jekyll/mr. Hyde situation (or an Homer/Snake situation, but with less hairs involved)