The Natsume and Ruka fanclub is run by Sumire Shōda. Little is know about it, only two members are shown: Sumire and Wakako Usami.
Sumire is also a 'bodyguard' for Natsume Hyūga, and shows a lot of feelings for him and Ruka Nogi. She wishes to marry them both. Wakako Usami is not very different from the leader of this fan club she also shows feelings for both Natsume and Ruka.