It was a girls night, and by that I meant the hashiras including you are having a sleepover. And since you, mitsuri and shinobu is only the female hashiras, you three decided to do something to prank the boys..

Mitsuri: "Okay okay.. How about.. We do a lyrics prank to the boys!" she smiled and giggled

Shinobu: "Oo~ I love that idea!" she smiles mischievously

Long short story, let's just say The girls and the boys got into a prank war..