Weekly Shōnen Champion
Written and illustrated by Eiji Masuda, "My Monster Secret" has been serialized in the manga anthology "Weekly Shōnen Champion" from January 31, 2013 to February 16, 2017 and collected into twenty-two volumes by Akita Shoten. Seven Seas Entertainment has licensed the manga for North America under the title My Monster Secret and published the first volume on January 12, 2016.