Tsukasa is a Japanese novelist and light novel author. He made his literary debut in 2007, winning an honorable mention in the first Shogakukan Light Novel Award for his work Right×Light, which became his first published series. His notable works include the light novel series Unlimited Fafnir, which was published by Kodansha under their Kodansha Ranobe Bunko imprint. The series ran from July 2013 to November 2017, spanning fifteen volumes. Unlimited Fafnir was adapted into a manga series illustrated by Saburouta and serialized in Kodansha’s good! Afternoon magazine from March 2014 to December 2015, and was also adapted into a twelve-episode anime television series by the studio Diomedéa, which aired from January to March 2015.

Tsukasa has stated that his inspiration to write came from reading an afterword in a book as a child where the author encouraged readers to try creating something if they had the desire. He often finds ideas while traveling on various forms of transportation. His other published works include Right∞Light, a sequel or follow-up to his debut, and the single-volume novel The Ninety-Nine Umbrella. He has also written the series Blazing Dragon Emperor and the Seven Pillar Special Zone in the Far East.