Takafumi Nanatsuki is a Japanese author and manga writer, born in 1976 in Osaka, Japan. He began his career as a writer of novels and light novels, initially working under the pseudonym Takafumi Inada before adopting the name Takafumi Nanatsuki in July 2004.

Nanatsuki is best known as the original creator of the light novel series Shomin Sample: I Was Abducted by an Elite All-Girls School as a Sample Commoner. The series, which blends romantic comedy with harem tropes, follows a普通 high school boy who is kidnapped and forced to attend an elite all-girls academy to serve as a commoner sample. The light novel was published by Ichijinsha under its Ichijinsha Bunko imprint, with the first volume released on November 19, 2011, and the final eleventh volume published on July 20, 2016. The series proved popular enough to generate multiple adaptations. A manga adaptation illustrated by Risumai was serialized in Ichijinsha's Comic Rex magazine from July 2012 to September 2018, spanning fifteen volumes. A spin-off manga, Shomin Sample: I Was Spun Off by an Elite All-Girls School as a Sample Commoner, also written by Nanatsuki and illustrated by Risumai, ran in the same magazine from January 2016 to July 2016. An anime television series adaptation produced by Silver Link aired twelve episodes from October to December 2015.

Beyond the Shomin Sample franchise, Nanatsuki is the author of the manga series Le Pâtissier de mes rêves (The Pastry Chef of My Dreams), illustrated by Ichigo Takano. This series has been published in multiple volumes since 2018, with the sixth volume released in December 2024. In addition to his work in light novels and manga, Nanatsuki has also written novels outside these formats, including a romance novel that was adapted into a live-action film. His career reflects a trajectory from light novel author to a creator whose original works have been adapted into manga and anime, establishing him as a notable figure in the production of multimedia franchise properties.