A detective is trying to find the cause of a string of suicides.

54 high school girls throw themselves in front of a subway train. This appears to be only the beginning of a string of suicides around the country. Does the new all-girl group Desert have anything to do with it? Detective Kuroda tries to find the answer, which isn't as simple as one could hope.—Anonymous

In Tokyo, when fifty-four high-school students commit a collective suicide, jumping from a platform in Shinjuku Station, the police force leaded by Detective Kuroda has no clue to follow. Then he receives an e-mail from a young woman, The Bat, advising that there is a site where red dots mean the number of persons that died. Kuroda and his team investigate the deaths going nowhere.—Claudio Carvalho, Rio de Janeiro, Brazil