An adolescent, Yakumo meets a young girl, Paï, and receive from her a letter of his father (who disappear since few years). In this letter, his father tells to Yakumo that Paï is one of the last specimen of an immortal race and that Yakumo has to help her to become a human.

Finally, Yakumo was going to die but Paï saved him and gave him the gift of immortality. This kind of power will bring lot of ennemies who want to gain this power. an excellent series !!