Ma Shoujo ~M-Otoko Zecchou Jigoku~

Mizuki Sakura is suddenly possessed by a girl who calls herself Ayako, and he is forced to ejaculate against his will every day.
As he was at his wit's end, Rinne Tachikawa, an upperclassman of his school and shrine maiden, tells him that the ritual of harmony between men and women passed down through her family might be able to seal away Ayako. However, in order to do so, he must endure seven days without ejaculating despite all the temptations from Ayako.

Will Mizuki resist the temptation to ejaculate and keep the seal intact?
Or will he succumb to otherworldly pleasure and fall into depravity?
The choice is yours...