Japanese name: ゼロの使い魔 小悪魔と春風の協奏曲
Rough translation: Zero no Tsukaima - The Concerto of the Little Devil and the Spring Breeze
Genre: Tsundere Adventure (LOL! I shit you not, thats what they label it as in the official site)
OP: Treasure, by ICHIKO
Official site: http://www.mmv.co.jp/special/game/ps2/zero/index.html