From MangaHelpers:

Three girls are the only members of the Fortune Telling department at Sakumigaura School where they each pursue their own style of tapping into their energy to find answers.

Hoshikawa Crystal uses her crystal ball while Nano Kari uses meditation and chi and Kaguyama Hime uses ancient spirits. The three are always together and help each other hone into their abilities but never forget to have a great time. [vyc]