Happy Seven(2005)

Original title: はっぴぃセブン ～ざ・テレビまんが～

Amano Sakogami is a girl who has an unnatural amount of bad luck. One day, she stumbles into the clubroom of the Better Fortune Research Organization, which consists of a boy and seven other girls who secretly use the power of the luck deities to fight against the Magatsugami, monsters who can affect a person's luck & well-being.