Keiko Suzuki is a lonely waitress in Tokyo. Her father passes away of cancer and she becomes obsessed with the passage of time. And so, three weeks before her 22nd birthday, she decides to record this period of time in the most accurate way possible, regardless of how lonely or banal this record ends up being.

When 54 high school girls throw themselves in front of a subway train it 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 he had hoped.