Mōsō no yūgana kasai

Mōsō no yūgana kasai 妄想の優雅な火災 (Literally meaning "Elegant fire of delusion") is the Zanpakutō used by Setsuko Kita.

ABOUT Mōsō no yūgana kasai
When Setsuko unseals her Zanpakutō, she shouts the command "Grow,Mōsō no yūgana kasai!" It resembles a robust hurlbat which moves faster than the eye can see and produces fireballs that can be directed by the wielder.