Mushiatsui Kara Nugu蒸し暑いからぬぐー; It's Hot and Humid, So Take It All Off!; Esta Quente e úmido, Então TIRE TUDO!

Ryota's older sister is a little strange. When her body gets hot, a mysterious energy builds up within her, causing a powerful explosion! The force of the blast, known as "Nugu", shreds all her clothes and leaves her completely naked!! But as long as it's only Ryota around, there's no reason to be embarrassed, right? They're siblings, after all.