Yukito, being the ambitious fucker he is, applies to be a domestic servant at a mansion. The landlady tells him he can only get the job if he masturbates in front of her. He gets the job.
A deadly virus that is only cured by ingesting semen?! Sounds like a dream come true! But when there's only one dude on the entire island and all these chicks to take care of... it starts to take it's toll.
