Unlucky student meets a girl that offers to exorcise a bad spirit possessing him, and from then on they go to solve many spiritual cases (almost always involving nudity) - although she tends to screw up more often than she succeeds. 

Spirits begin terrorizing a school and it is left up to the sexy student Kocho Enoki to use her attractive body and magical powers to defeat the attackers. Teamed with her sister and Kosaku, their human decoy, they attempt to free the school from the spirits. Unfortunately a female spirit arrives who is immune to Kocho's sexy charms.
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(Source: Anime News Network)

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