Yumi is really a busty, dark haired beauty who is able to give her students what they really want. But unfortunately, she's never been efficient at getting what she wants and lately everything is apparently failing. First she gets an unpleasant break-with her fiance, and after that she's sexually harassed through the Vice-Principal. One thing brings about another... and before she knows it, the VP and some very horny students trap her into a hot and orgy.

After ravishing her continuously, they make her swear for being their secret sex slave. Now, Yumi's only hope could be the reluctant Katsutoshi and his perky girlfriend Keiko. But even using their help, it's going to be a hardship on Yumi to flee her bonds of sexual slavery, since everyone appears to be hot for teacher...