Kou Mukami

Kou is the second son of the Mukami family. When he was still a human, Kou was an orphan who was abandoned in a manhole, thus having no knowledge of his birth parents. His only desire that time was to see the vast blue sky out of his manhole. He eventually ended up in the orphanage and became a playtoy for the aristocrats due to his beauty. He was abused everyday and he forced himself to accept being a playtoy since he was able to have a lot of 'nice' things from the orphanage. This resulted him losing his right eye and since his wounds weren't given time to heal, he ended up having scars all over his body. As a result, Kou grew up believing that the world is about 'give-and-take'. He met his brothers, Ruki, Yuma and Azusa and attempted to escape the orphanage with them, but got shot by the orphanage staff. He met Karlheinz as he was dying and was offered another chance to live, but as vampires. Kou accepted the offer in order to see the blue sky again and after he was turned into a vampire, he was given a magical prosthesis eye that enables him to see into people's hearts. He is also a haraguro  type which only happens when something doesn't go his way or he isn't given anything back. On top of that, he is an idol in the 'present' human world which gives him the advantage of using his beautiful and pristine features to deceive his fans and others. He is also rivals with Subaru and seems to enjoy provoking him when it comes to Yui.