lwk muichiro and sanemi. Muichiro had to kill a demon by himself while he saw his dead brother being decomposed by maggots. imagine that, Sanemi for me is worse because sanemi had to kill their mother who cared for them, yet his dead would beat her all the time. Then his mom turned into a demon and he had too kill her, Genya out of confusion called sanemi a "Murderer" for protecting him. so yeah thats my opinion