they all got transformed to their opposite gender. They wake up with their uniforms tho. Giyu, sanemi, tengen, Gyomei, muichiro, Obanai, tengen, and rengoku have turned into girls, while shinobu, and mitsuri have turned into boys.

Sanemi - she wakes up, now a girl “E-EH?!” looks down at her chest

Giyu - “...” just confused

Tengen - “Ugh! So UNFLASHY!!!!”

Rengoku - cheerful voice “WHAT IS GOING ON?!”

muichiro - “…”

Mitsuri - “...hn?...”

Shinobu - “Ara~ Ara~ Tomioka-san~ now you'll know what being short is like~”

Gyomei - praying “Namu Amida butsu...”

Obanai - “If I still got Kaburamaru, I'm okay...”