This study examined the effects of Niko Niko Room's educational support program held during the second semester of 2008 on school children. Fourteen school children who participated in this program answered questionnaires before and after this program. Their fourteen guardians also answered questionnaires at the end of this program. The results showed that the effects of this program held during the second semester of 2008 were almost the same as the effects of the first semester. The findings of this study were as follows: (1) Educational support had a positive effect on children's "self-efficacy regarding arithmetic". (2) Both children and guardians positively evaluated the effects of this program, and both of them estimated students' abilities high. (3) Children's estimation of students' communication had a positive relation to their "interests in arithmetic". Guardians' estimation of students' communication also had a positive relation to their estimation of "their children's interests in arithmetic".