Japan, feudal era. In this game, you are Tsukinomori, a samurai. After a very difficult battle, during a night of full moon, you are walking hurt and alone in the forest when you see a mysterious light emanating from inside an old sacred tree. Investigating, you find inside a beautiful girl, naked. Her name is Hime, and she is the promised daughter of the moon who comes to the Earth every 50.000 years to change the story of the humanity. Is she an angel or a devil? Will she bring salvation or destruction to the human race? It is up to you to decide by becoming her guardian, tutoring her and teaching her all she need to know in order to find her true destiny...