ルルーナ

"Merely by looking at you, my pulse increases by twenty beats, and my body temperature rises by half a degree, causing a subtle sweat. I suppose this is love." Luluna is a tranquil witch princess. She has a "true name," but it can only be divulged to the one she has made a love pact with. Her doll-like face betrays no emotion. As if anointed with porcelain, such immaculate beauty only serves to accentuate this impression. Luluna has traveled to the human world to fulfill the love pact she made with Yuuta. You’ll have to count your lucky stars to see a hint of emotion cross her face. When confronting Yuuta, this stoic mask falls and a gentle flush colors her cheeks. She will be entering Shinonome Academy as a 1st year student. [From MangaGamer]