Ojou-sama Yomeiri Kousou!

One day, Amakawa Mamoru receives two love-letters. When he goes to meet their senders at the appointed place, the rooftop, he finds two diametrically opposite girls waiting for him. One, Sumiyoi Sakura, is a refined black-haired beauty and quintessential Yamato Nadeshiko. The other, Kurosaki Ageha, is a doll-like twin-tailed platinum blonde.