One day Yakumo, a high-school student in Tokyo, met a girl named Pai. Pai was not human. She was Sanziyan-unkara, an immortal being with mysterious powers. Yakumo promised that he would find a way to make Pai human. Together, they set out to Hong Kong on a great adventure that was to begin a modern legend!

Now, the adventures of Pai and Yakumo continue!Yakumo returns to Japan believing that he can resume his old life as a high-school student, an existence he had left behind -- ignoring Pai's warning that to do so will subject everyone he knows to the evils of hell itself.