Gakuen no Hime Kouryaku Hajimetara Shuraba ni Natteta Ken

Yuma Kanbara lands in a bind when his younger sister, Ayane, uncovers an embarrassing secret from his past and uses it to blackmail him. Her price: he must secure her a place among the Hime 6, the six coveted titles awarded to the top finishers in Himegasaki Academy's renowned election. To clear her path, Ayane pushes Yuma to win over her rival candidates one by one. Charming the school's most admired beauties proves anything but simple, and as he gets entangled with them he is drawn into the increasingly tangled romances of the princesses themselves. Egos, scheming, and affection collide in a chaotic school comedy.