Cosmo Na Bokura!

From MegKF:
This 4 volume manga is about Haruko, who, after her mother’s death, gains her mom’s familiar and her witch’s name. Unfortunately, Silk, the cat familiar, has been unable to teach Haruko any magic but dream communication. But beware, if anyone finds out her witch name, she’ll have to obey that person. Is this real, or is it all in her mind?