Even though he is discouraged by his father Shinjurou Rengoku, who is the current Flame Hashira, young and upcoming Demon Slayer Corps member Kyoujurou Rengoku is determined to follow in his footsteps. When the time for the recruit's first mission arrives, Kyoujurou is immediately exposed to danger as he encounters a formidable demon. While contemplating the meaning of protecting others, Kyoujurou must emerge victorious from this encounter no matter what.