Kamoike Ran

Her hobby is to make money; she believes that "even dirty money builds houses" and swindles the boys out of their money by pawning off things like "how to be popular among girls" (false, of course) and "a picture of a naked woman" (supposedly). The only subject she's good at is counting money. Despite her less than timid activities, she's actually quite shy and is uncomfortable being in a group.

Edited from MangaGamer