The purpose of this study was to investigate the effects of details in a story on interestingness and comprehension. Seventh-grade students were assigned to one of 3 groups reading versions of the same plot story, which were manipulated the degree of details and in the part of details: version telling about the plot itself (Ver. P); version telling the details in the plot (Ver. D1); version telling the details independently of the plot (Ver. D2). The degree and quality of interestingness and the relation between interestingness and comprehension were analyzed as follows. 1) The degree of interestingness of Ver. D1 was higher than of the other versions. In particular, the analysis of impression terms showed that Ver. D1 prompted touchingness among many kinds of quality of interestingness. 2) The group of reading Ver. D1 showed more particular comprehension of the character's personality than the other groups. 3) A significant correlation was seen between the degree of interestingness and the particularity of comprehension of the characters.