The demon-slaying missions have a profound emotional impact on Tanjiro and his comrades in "Demon Slayer: Kimetsu no Yaiba." They experience a wide range of emotions such as grief, anger, determination, and sometimes guilt. The constant exposure to violence and loss takes a toll on their mental well-being, but it also strengthens their resolve to protect others and seek justice for the innocent. Additionally, the camaraderie and bonds they form with each other serve as a source of emotional support and motivation to continue fighting against the demons.