Suema was the last target of Dr. Kisugi, the serial killer of 5 years ago. From this, Suema gained a very high interest in criminal psychology which makes her a bit of an outcast among her classmates. After running into Nagi Kirima she also gains an interest in the supernatural occurrences in her city and through the course of the Boogiepop series she seeks to uncover the truth behind these incidents.

Boogiepop and Others
There is an urban legend that tells of a shinigami that can release people from the pain they are suffering. This "Angel of Death" has a name—Boogiepop. And the legends are true. Boogiepop is real. When a rash of disappearances involving female students breaks out at Shinyo Academy, the police and faculty assume they just have a bunch of runaways on their hands. Yet some students know better. Something mysterious and foul is afoot. Is it Boogiepop or something even more sinister...?