After all this time looking to the shinigami that had killed his family, found Missa, which later became his girlfriend, Shiro had made a deal with a shinigami, consisted of that if Missa gave his soul to the God of death, he instead gave shinigami eyes , which allowed him to know the location of each of the shinigami, long after being a couple, Missa told Shiro treatment that she had done with the shinigami Shiro asked Missa to help her to  know where was Ryu and take revenge for what he had done to his family...