Chocolate Cosmos(チョコレートコスモスChokorēto Kosumosu) is a Japanese shōjo manga series written and illustrated by Nana Haruta. The series was serialized in Ribon magazine from the September 2007 issue of the magazine until its final chapter in the November 2008 issue. The individual chapters were collected into four tankōbon volumes by publisher Shueisha; the first on December 14, 2007 and the final on November 14, 2008.