東立出版社
"MM!" began as a light novel series written by Akinari Matsuno, with illustrations by the group made up of Tometa Ohara and Koharu Sakura. Media Factory published 12 volumes between February 23, 2007 and September 24, 2010 under their MF Bunko J imprint; 10 comprise the main story, while the other two are side story collections. The series was left unfinished due to the author's death on April 18, 2011. The novels are also published by Tong Li Publishing in Taiwan.