伊藤さんとブルマでえっち！

"It's definitely because of these bloomers..."

In the near future, a certain engineering school's student council is headed by a girl named Itou. One day while sorting things in the storage room, she comes across a relic from a bygone era... a pair of bloomers.

Her kouhai Inaba suggests she put them on -- as a joke, really -- but the garment was enchanted with a terrible, sexy curse... It turns Itou into a huge slut! Inaba's not exactly complaining, though...