A race of butterfly-demons named the Mahoroba want to enslave Miko Mido and her sister to steal them the seal case that control the Shikima. Their ultimate goal is to conquer the Shikima Brain, a legendary place of the Shikima realm which is said to confer the power to rule the universe.
 
(Source: Anime News Network)

Miko Mido has fallen in love for the first time. Too bad for her that she hasn't the time to pursue the man of her dreams. There is a mysterious female ghost which is attacking Miko's schoolmates and stealing their life-force, and someone has to investigate the case. However, it seems that the ominous phantom is willing to pursue Miko's love interest, too...
 
(Source: Anime News Network)

The story involves various ninja clans who continually fight each other. The female protagonist is Miko Mido, a young ninja-in-training and the next leader of the Miroku ninja clan. This clan has control over the Shikima, a perverted race of demons. However, when thieves steal the magic compact giving the clan this power, Miko has to fight the Shikima, utilizing her "sexcraft" ninjitsu in order to save the world. 
The Shikima live in a parallel dimension called the Shikima world, and one must perform specific sexual rituals in order to travel there. The Shikima are all sex-hungry monsters, led by the Shikima Lord, who also happens to be Miko Mido's father.

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