The creator known as G.O. is a Japanese manga writer whose professional work is primarily documented through published series in the early to mid-2010s. G.O. is identified as a pseudonym, with the Bibliothèque nationale de France listing the individual as a manga artist born in the 1900s.

G.O. is best known as a co-writer of the mystery and horror manga Tohyo Game: One Black Ballot to You. This series was written collaboratively by G.O. and another writer using the name Chihiro, with illustrations provided by the artist Tatsuhiko. The story was serialized in Square Enix's seinen manga magazine Monthly Big Gangan, running from April 25, 2014, to August 25, 2015. The complete series was compiled into three tankobon volumes, which were released between November 2014 and October 2015. The manga was subsequently licensed for an English-language release in North America by Yen Press.

In addition to Tohyo Game, G.O. is also credited as the scenario writer for the manga Death's Choice, working again with the storyboard artist Chihiro and illustrator Tatsuhiko. This collaboration indicates a consistent creative team across projects. The available publication history suggests that G.O.'s work falls within the seinen demographic, which targets young adult men, and often incorporates elements of psychological tension and horror. The writing credit on these series is shared, making it difficult to isolate G.O.'s individual contributions from those of the co-writer Chihiro. Nevertheless, the published record confirms G.O. as a professional manga author with works distributed by major publishers like Square Enix in Japan and Yen Press internationally.