式守 伊吹

Ibuki is a young girl and powerful mage who transfers into Sumomo's class. Most of the time, she is very standoffish and will push people away from her either figuratively or literally, so as to be left alone. Her family is known for being well-advanced in terms of magic, and even at such a young age Ibuki has shown herself to be well skilled as she uses her magic wand named Bisaim (ビサイム), which takes the form of an umbrella. The Kamijou family has been serving the Shikimori family for generations. This explains why Saya and Shinya Kamijou are always with Ibuki and act as her protectors and followers. 

She wanted to retrieve the Shikimori treasure for a reason that she wanted to see her sister, Natsumi, who died from sealing the angel demons that came out of the treasure. She mistakenly thought that Haruhi, because of her great skills in using magic, is the daughter of the woman who hides the treasure.

Taken from url=http://en.wikipedia.org/wiki/Happiness!#Characters