Tomohiro Kato committed one of the most shocking mass murders in the country's recent history.
He was 25 when he drove a truck into a lunch-time crowd of pedestrians at Akihabara shopping district, killing three people.
He then stabbed passers-by with a dagger, killing four and wounding eight.
He was apprehended by police at the scene and later admitted his crimes in his trial, saying he had been angered by online bullying.