Futatsu no Tamashii

Jason Misawa is a typical high school boy until the night he gets attacked along with Yumi by an unusual creature. He is almost dead when a voice offers him power, and when he awakes he sees that he is a different person. He views the real demonic faces that are masked by the ordinary people, the mark on his hand can overpower the strongest, and he starts to be in peril constantly. Jason wants to know what took place that night, what this power signifies, and the reason why these monsters are manifesting in his life.