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--!?