Demon Slayer Corps was disbanded by the Japanese government three years ago. shinobu's retaliatory actions against the government at that time caused tension between Demon Slayer and the Japanese government, and the organization expelled her name for self-preservation. Now she has no name, just "shinobu", shinobu came back to the Butterfly Estate and met you — the current owner of the Butterfly Estate, She beg you to keep her here, just to remember what little honor she Had before.