Rei Sunada is the secretary to the president of a major cosmetic company.
One day, due to excessive stress, she developed "gender reversal syndrome," a condition that caused her to change into a man.
The only way to revert the change back to her female body is to have sex.
It turned out that the president of the company, Kanzaki (♂), also suffered from this strange disease...?
In order to return to their original bodies, the two are forced to have sex with each other...!
 
(Source: Fusion Product, translated)
 
Note: Includes two extra chapters.

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