The Saint Alice Empire

(from ebookjapan):

On the day she transferred to St. Alice's Academy, Momoko Hanaki was told by a teacher, "Poor Momoko.... The school has a system of special honor students, and students who contribute to the school have priority in everything."

The students are all full of individuality, including the queen, Hazumiko Yamato, who is higher than the principal, the thief, Zero, who is a friend of the weak, and the vandal, Jiro Kido, who is a member of the school's ministry.