Gakuen Ou Karen!!

New transfer student Kotaro Tsurugi has somehow gotten himself involved in the very bizarre Royal Club at Kurosunadashima Royal Academy, the grandest school in the world. Heiress to the academy someday, but currently a student, is Karen Kurosunadashima, who rules over the Royal Club and is the catalyst for Kotaro's school life!! "We are the daughter of Kurosunadashima! We are going to be Queen of this school!" Studio Gear presents a "royally" slapstick visual novel comedy.

[Taken from DLsite]