Towako Kabara, an English teacher newly appointed to the middle school division of Saint Joachim Academy, becomes interested in the case of a teacher named Sarasah Togawa, who
was said to resemble her and was murdered by someone at the academy 14 years ago. Towako wonders if Sarasah might have been asexual, just like herself. Meanwhile, in the
city, the serial killer Takeshi Yaginuma was dismembering another victim. Yaginuma still harbors an abnormal obsession with the deceased Sarasah. And his fifth victim was the
mother of a student Towako teaches... When the fates of Towako and Yaginuma intersect, an astonishing truth is revealed!