Living under constant threat of demon attacks is sure to either bring out the best, or the worst, in people, and such a grim scenario is close to what is portrayed in the world of Koyoharu Gotouge's Demon Slayer: Kimetsu no Yaiba. As a result, selflessness is a rare quality seen only in the select few who are willing to lay down their lives to protect others, which is no easy feat by any means.