Koharu is attending a prestigious ninja school.
She's strong-willed, a little feisty, and ultra-competitive with her older sister.
Kuroya is a boy attending the same school.
He's a contrarian with various complexes, but he's a master of the bedroom.
The two always end up in each other's way, and don't get along at all.
And so fate would have it that the two would be paired up for their once-in-a-lifetime ninja exam.
However, Koharu is determined to show she's every bit as talented as her sister, no matter what.
However, it seems Kuroya received a powerful item from the village leader before the test,
and its power forces Koharu to submit fully to him.
If she goes afoul of the contract, she'll have a womb climax.
And so the exam begins...