Lapis Idocrase is the youngest daughter of a family of accomplished mages. Her parents and four older brothers are powerful; she is not. Attending magic school under the unofficial title of "Burden of the Idocrase Family," she decides to attempt a qualifying test for a more advanced institution. The requirement: collect a number of artifacts called Twinkle Gems, which are produced by strong human emotions. This means spending time in the human world, where a group of difficult and unpredictable men is apparently waiting for her.