Setsuna is kidnapped by Princess Aiya, daughter of the deputy shogun. Wanting to escape her studies, Princess Aiya begs Setsuna to be her body double for a day, but the princess’s new tutor turns out to be Hisui posing as his older sister Kin’u!
Your sister? The one who makes
equipment for the demon slayers?
أختك؟ تلك التي تصنع المعدات من أجل قتلة الشياطين؟
Deine Schwester?
Die die Ausrüstung der Yōkai-Jäger herstellt?
Tua sorella? La ragazza 
che produce le armi per i cacciatori?
A que faz os equipamentos
para os exterminadores?
Которая делает оружие
для охотников на демонов?