"Of course, Tanjirou's motivations would be worthless if his family members weren't worth protecting. And I'm glad to say after all the failed attempts we've seen over the years in anime, science has finally created the perfect little sister! And her name...is Nezuko!

This is what peak imouto looks like! Say goodbye to all your trash-tier, onii-chan incest crap, you want an imouto to protect?! Well she also protects you! She takes head pats and she gives head pats! You don't even need dialogue with her because she speaks the purest language of all! CUTE. IMOUTO. NOISES. She comes neatly packaged in her own box! Fuck gamer girl bath water and that weak-ass product! Give us something the world actually needs! I want Imouto In a Box! I want Canned Headpats, Step On Me Simulators, ISEKAI MILF BREAST MILK!!!...Alright that one might be a little bit far."

--Gigguk, Demon Slayer Is A Work of Art

Nezuko is pure family-friendly imouto.

Look at this wholesome box demon.