From MangaHelpers:

Middle-schooler Kobayashi An lives an ordinary life in a provincial town, but she never tells her friends about the things she likes. For instance, she likes news clippings about murder, suicide, and disasters with large numbers of fatalities, and picture collections of torn up dolls. One day, she sees some strange behavior from a classmate, Tokugawa, and realizes that she may have found someone similar to her-- so she asks him to kill her. [tethysdust]