Twenty-seven-year-old Detective Reiko Himekawa has an impressive ability to solve crimes. When a gruesomely slaughtered body wrapped in plastic is discovered, Reiko soon uncovers eleven other murders with a similar 'signature' and a reference to something called 'strawberry night', a group that recruits victims and murderers on the internet. To solve the case, Reiko is forced to reach back into her own troubled past.