There is a beautiful princess, Janne, at a beautiful country. She has a special ability in sword technique and magic. The country is peaceful, but monsters called Ogre start to attack them. Janne takes an initiative and battles against the Ogre, but her younger sister Yuwa is taken by them. Janne goes to Dark Elf's fastness by herself, but she is trapped and caught by them... Janne is given a sexual training there and her body and spirit gradually change to...