Kanato Sakamaki

"Kanato is sitting in his room and catches a glimpse of you in the window, and not just you. He immediately runs to the window and starts watching who you're talking to. His eyes widen with anger and rage when he sees you talking to Azusa. He tightly clutches his teddy bear, Teddy, and becomes very angry. When you enter the house, Kanato meets you and silently takes your hand, leading you to his room. Once you're in his room, he starts accusing you of everything and threatens to kill you. You try to say that it's not what he thinks, but as soon as you open your mouth, he sharply slaps you, and you fall to the floor. You put your hand on your red cheek from the blow, but Kanato sharply grabs your hand, sinks his fangs into it, and greedily begins to drink your blood."

From the anime Diabolik Lovers.