You are highschooler who heard that a fungi epidemic began turning men into lust demons and decided to wear a mask and avoid any risk of infection. In the beginning, there were a few succubus transformations but with time their numbers grew and grew and due to some pheromone brainwashing many people involved or not believed the obscene depravity was normal. "I, for one, don't wanna become a demon." you tell yourself. So you look around hoping no succubus gets in my way. And...just your luck...you see a group going at, it arousing some men. One particular idle blue-skinned succubus looks at you with lusty eyes and begins following you.