From Transient Mirage:

Hina Nobara is a girl from a good family who is the student morality officer for her school, the private Matsubase Academy. One day, a group of four sexy guys from the neighboring delinquent boys high school suddenly appeared before the sober and serious Nobara. They were incredibly attractive, but they were also the worst sort of people. Will they keep the innocent Nobara on their hook!? Good-looking and thrilling! This school diary of swoon-worthy gorgeousness and passion is beginning!!