Tears of blood

A young boy (Kai) is searching for his lost sister. Apparently he's a vampire and had been seperated from her since they were little kids. He gets beaten by the humans when they figure out that he's a demon as that what the humans believe vampires are. He gets powerless to even move. While he's walking he sees a house which is shining the brightest from all the other houses. He knocks on the door and a young boy (Taichi) opens the door, looking at the boy strangely. As (Kai) suddenly gets unconscious (Taichi) quickly grabs him. Later they get to know each other and become friends. (Kai) later figures out that his sister is stil alive and is a famous singer called "Dust" who is very popular and is (Taichi's) favorite singer. Will (Kai) find his long lost sister and will (Taichi) figure out that (Kai's) actually a vampire?? You'll have to read it to figure it out :D