Postgirl

, is a Japanese light novel series written by Jiro Masuko, with illustrations GASHIN. The series began publication on June 10, 2002 by ASCII Media Works under their Dengeki Bunko publishing imprint.

Synopsis
Nice to meet you, I'm Caucasian Mono. After the entrance ceremony the other day, I became a first year high school student. She's a normal girl, though she says it herself. … But recently I have one secret. A secret that is too embarrassing to tell anyone at all ...! An evil organization that mosaics the city saying "Purify the shameless world"! A beautiful girl squadron that prevents it! There is laughter, there are tears, there is love It's a romantic comedy like a mountain, and it's the beginning.