The purpose of the present study was to examine the relation between narcissistic orientations (grandiose sense of self-importance, interpersonal exploitation, and narcissistic rage) and relational aggression (self-satisfactory and punishment type) and the mediating effects of guilt feelings toward and perceived classroom norms against relational aggression. The sample consisted of 240 5th-grade and 6th-grade students (10- to 12-years-old) from two public elementary schools and 307 7th-, 8th-, and 9th-grade students (12- to 15-years-old) from two public middle schools in Japan. Results of structural equation modeling demonstrated that narcissistic rage was positively associated with relational aggression (punishment type). Moreover, interpersonal exploitation was related to more relational aggression (self-satisfactory and punishment type); however, guilt feelings toward and perceived classroom norms against relational aggression mediated this association. Age and gender did not largely affect these effects. Social and developmental processes involving relational aggression, narcissistic orientations, and guilt feelings and perceived classroom norms were discussed.