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A young exorcist in training notices that there is a spike in demonic energy at the high-school he attends.
At the same time a lot of the more fashionable girls there seem to either be having some pretty serious growth spurts or getting a lot of plastic surgery.
Investigating the matter, he finds that a mysterious shop has been selling a popular line of tiger-print lingerie that promises the wearer increased bust-size.
It seems to work too, but the exorcist discovers a horrible downside.
The lingerie is cursed!
It slowly possesses the wearer with the spirit of a ravenous oni.
Increasing their libido and base desires until the oni spirit takes over completely and they transform into a monstrous (but still suspiciously hot) ogre-form.
The only way to stop this from happening is for the young exorcist to get rid of the lingerie and to exorcise the oni spirit.
Getting rid of the lingerie is hard enough, he's no Happosai.
But in order to exorcise the spirits he must perform an esoteric ritual.
And if the girl is too far into her possession then our main character must "dispel" her lusty desires before he can banish the offending spirit. (And no, he can't use his penis. Only a virgin can perform the ritual to exorcise the oni.)
