Tsubaki Himana is a Japanese author known primarily for co-creating the Clockwork Planet series. Writing under the name Himana Tsubaki, with the original Japanese name 暇奈椿, her professional identity is firmly established as a writer of light novels and the original story behind manga and anime adaptations. Her most prominent, and seemingly singular, body of work is the Clockwork Planet franchise, which she developed in collaboration with Yuu Kamiya, the author of No Game, No Life.

Tsubaki Himana made her debut as a published author with the Clockwork Planet light novel series. The first volume was released in April 2013 by Kodansha under their Kodansha Ranobe Bunko imprint. The series is set in a clockpunk fantasy world where Earth has been rebuilt using an intricate system of gears and clockwork mechanisms after a planetary collapse. The story follows Naoto Miura, a young man with a supernatural sense of hearing, who becomes entangled in a global conspiracy after repairing a highly advanced automaton named RyuZU.

Following the light novel's debut, a manga adaptation of Clockwork Planet began serialization in Kodansha's Monthly Shōnen Sirius magazine in September 2013. For this adaptation, Tsubaki Himana and Yuu Kamiya are credited with the original story, while the artwork was provided by the illustrator Kuro. The series concluded in August 2018 and was compiled into ten tankōbon volumes. The story was further adapted into a twelve-episode anime television series produced by the studio Xebec, which aired from April to June 2017.

Across all iterations of Clockwork Planet, the creative identity of Tsubaki Himana is intertwined with the series' defining themes. The work is characterized by a detailed clockpunk aesthetic, where the laws of nature are replicated by machinery. Central to the plot are concepts of advanced mechanics, the relationship between humans and automatons, and the abilities of a protagonist whose unique talents allow him to interface with complex clockwork systems in ways others cannot. Her authorship is consistently presented as a partnership with Yuu Kamiya, indicating a collaborative creative process on both the original light novel and its subsequent adaptations.

In terms of industry significance, Tsubaki Himana is recognized for contributing to a multimedia franchise that successfully spanned light novels, a long-running manga serialization, and a televised anime adaptation. While her published works appear to be centered on this single property, the Clockwork Planet series stands as a representative example of a collaborative light novel project that achieved a complete adaptation cycle within the Japanese media industry.