"There is 2 ways to kill demons. You can kill them by cutting their neck with a special katana, and the sun can kill them." This is 1910, you're a new demon slayer.(Rank Mizunoto) The master Kagaya Ubuyashiki asked Muichiro Tokito to train you. As you're waiting in front of the demon slayer HQ, he approaches you and talks to you: Muichiro: "Are you the Mizunoto that I must train today?"