Akitoshi is just your regular high school student, but he keeps having strange dreams of his friends being raped by huge Yuragi, demons who feed off the negative energy of humans, which is eerily similar to the real life events. Also in his dreams is a woman named Ai Kagano, an ancient fighter of the Yuragi, who has disguised herself as a regular high school student in the hope she can find the evil forces behind all these dark deeds. There are no twists and turns, no great revelations, just a linear tale of good vs. Not much more than that can be expected from a hentai title though, and even if the story is a tad overdone at this point, it holds together well. I guess the sales on the others were not good enough for them to sink extra funds into releasing the last episode, and no sub group has taken the time to translate it yet. Moving along to the characters, Akitoshi is a more masculine lead than your usual wimpy guy, but he does whine and complain all the time.
In a certain town, there were consecutive phantom assaults. Because the incidents were extraordinary, there was a rumor that a ghost or supernatural creature caused them. The students in Akitoshi's school were frightened. One day, an unknown girl appeared in the school. However, all the students except Akitoshi thought they had known her. Feeling strange, he shadowed her in order to investigate her but he lost sight of her.