When the bizarre mass suicide of 54 high school girls throwing themselves in front of a subway train appears to instigate a string of suicides around the country, Detective Kuroda strives to find the answer, which isn't as simple as he had hoped.

Shin is a Japanese university student living a boring and meaningless life. One day, he spots a book titled Dangerous Ways to Walk the World, in which he finds a page written about hazards in New-York. Eager to get out, he jets off to New-York to find this inspiration.