Wataru and his fiancee Haruka live quietly in a small village. They were meant to be together forever... but suddenly, their happy life is taken away by monsters, and they spend their days fighting monsters in desperation.
One day, Wataru is captured by a succubus, but the succubus turns out to be the one who killed Haruka.
The succubus proposes a deal to the enraged Wataru. At first glance, it seems like an easy win, but of course the succubus won't let Wataru win that easily.
Wataru, a virgin, is carefully loosened up and reacts to the humiliation. And of course he can't withstand the unimaginable pleasure caused by the strongest sperm-milking tentacles... he ejaculates in no time...
...I can't! He has been magically sealed from ejaculation!
Furthermore, the effect of the succubus' saliva has turned his balls into balls that have not been masturbated for a year. From here on, he is violated nonstop for 12 hours, a hellish time. His desire to ejaculate grows endlessly... And when his release comes... What choice does Wataru, who is on the verge of exploding, make?