Analysis on general criminal statistics of heinous offenses, which are featured in the special article of this White Paper, and analysis on the special surveys have revealed the following 5 noticeable trends that seem to be necessary to correctly understand changes in heinous offenses: (i) "changes in young offenders (juvenile offenders aged 14-19 and offenders in their 20s)" and (ii) "changes in offenders related to organized crime groups and foreign national offenders," focusing on the attribution of offenders; (iii) "social background and its influence," focusing on motives and background factors of offenses; (iv) "changes in regions where crimes arise," focusing on regions where offenses are committed; and (v) "increasing damage to females, minors, and elderly people," focusing on the attribution of victims. In this Chapter, we will carry out analysis using these 5 key concepts to grasp changes in heinous offenses in the order mentioned above.