I had read elsewhere that the girl was an aspiring mangaka (manga, Japanese comic book, artist). So it is pretty simple to conclude that she was heavily into anime and manga. The image on the right comes from the Higurashi manga - it’s quite similar to the crime (click the image to enlarge).
This troubling incident took place last week. It’s still newsworthy however, since it’s not an isolated case. Although another similar incident has occurred since then, it seems the series (24 30-minute episodes) is continuing anyway.
The 12th episode of Higurashi no Naku Koro Ni Kai murder mystery anime aired on TV Tama in Japan’s Saitama Prefecture, Sun TV in Hyogo Prefecture, and Chiba TV in Chiba Prefecture on early Tuesday morning, despite the episode’s earlier preempting on two other stations due to an axe murder case - and despite the news reports of a second axe murder attempt.
Here’s how they report the second incident, inspired by this horrible anime series containing gratuitous violence committed by children:
Officials in the Nagano Prefecture city of Tatsuno received an emergency phone call at around 2:05 a.m. Monday morning from a woman who said, “My child wounded my husband.” They found the 44-year-old husband bleeding from his head at the family’s residence. About twenty minutes later, the second oldest son, a 15-year-old third-year junior high student, voluntarily appeared at a nearby police station and reportedly said, “I struck my father with an axe.” Police arrested him for attempted murder.