Rui Kamishiro is a mage from the dark kingdom. He appears in his kingdom as something like a prince, who carries out the dirty orders of the king. And he was once again ordered to kill a strong knight from the light kingdom - Tsukasa Tenma. He, like the king, does not like people from the bright kingdom and can kill them without regret. Including will try to finish off Tsukasa.He is quite smart and has his own way of thinking. He can achieve his goals in any way he wants.