Relationship between offender and victim plays important role in the commission of crime. In most cases, in 51,255 incidents (about 31.00%), we have found that the relationship between criminals and victims are as they were peer groups. It means that people who were familiar with them victimized most of the victims. Peer group includes friends, neighbors, colleagues, playmates, and the like. Peers can be the source of support as well as harassment. In Japan in many contexts, peers act together to humiliate, disgrace, torment a specific mate – a practice known in Japan as ijime.