In order to solve our energy and environmental issues, it is important not only to make the efforts
by industrial fields but also to promote pro-environmental behaviors (PEB) in our daily lives. It is however
difficult for us to keep doing PEBs for long time. In order to keep it, it can be effective that they join an online
community because a group norm of continuous PEB is expected to be fostered in such community. In this
study, an online community named ¡Èeco club¡É has been proposed which is modeled on a school club activity
where the group norm works well. When joining the community, participants have to play a role of senior/junior
student of ¡Èeco club¡É. The community also introduces Sakura who is an active participant to arouse a good
atmosphere and create a positive relationship among community members. The proposed community was
evaluated through a subject experiment and the effectiveness was confirmed.