別冊フレンド
The manga is written by manga artist Ayu Watanabe. The chapters have been appearing monthly in Kodansha's shojo manga magazine, "Bessatsu Friend", since 2009. A drama CD was bundled with the release of volume 8 of the manga. The series concluded in the September 2017 issue. A two-chapter bonus manga was released in the magazine's October–November 2017 issue. The manga series was packaged into 24 volumes.