Kami Ka Akuma Ka神か悪魔か; 神or恶魔?; God Doesn't Play Dice; God or Devil; Kamika Akumaka; God? Devil?

From Chibi Manga: A girl who dreams of fated meetings - Kizuna. The one she met in a suspicious western-style house, the "Yûrei Library", was a good-looking but demon-like young man - Rû. On top of that, Rû has an unbelievable secret...! A cursed love hidden in the masterpiece "Romeo and Juliet". Searching for a new ending, the gears of fate have started to move--!?