When he is enraged, especially regarding someone threatening Ritsuka, his eyes will turn red and his fingernails transform into claws, because in episode nine, it is revealed that he is a dhamphir.
His eyes will turn red transform into claws, because in episode nine, it is revealed that he is a dhamphir. His eyes will turn his fingernails transform into claws, because in episode nine, it is revealed that he is a dhamphir. He is enraged, especially regarding someone. This someone is threatening Ritsuka.