Pentabu is a pseudonymous Japanese author known for writing the popular blog-turned-book series "My Girlfriend's a Geek," also known as "Fujoshi Kanojo." The series chronicles Pentabu's own experiences with his girlfriend's fujoshi (a female fan of yaoi, which is a genre of fictional media that focuses on romantic relationships between male characters) lifestyle. The blog gained a significant following due to its humorous and candid look at otaku culture and relationships. The success of the blog led to its adaptation into a light novel series, a manga, and even a live-action film. Not much is publicly known about Pentabu's personal life, as he maintains his anonymity.