Hirarin is a Japanese manga artist, illustrator, and original creator known for a career closely tied to writer Otsuka Eiji. Early on, Hirarin frequently submitted fan works based on Otsuka’s manga Seikon no Joka, which led to a position at Otsuka’s personal office, Monogatari Kankyou Kaihatsu. Following this, Hirarin began working as a character designer for Otsuka’s projects, starting with the sequel Shin Seikon no Joka. Hirarin also contributed to the notable manga MPD Psycho, illustrated by Tajima Shōichi, by providing crime settings and explanations of criminal methods. A self-portrait of Hirarin appears as a bearded male character within MPD Psycho itself.

As a creator, Hirarin has produced a range of manga works across different publishers. One of the earliest credited series is the four-panel manga Tajūgoku Tantei Saichoko, which ran in Monthly Shōnen Ace from 2001 to 2010. Hirarin served as the original writer for the series Hakai-shin Muha Jirūn, which was illustrated by Hoshiki. A significant portion of Hirarin’s creative output is centered on the Noroiya Shimai series, which began serialization in Monthly Comic Ryu in 2006. This fantasy series about sisters who run a magical curse shop became the foundation for multiple subsequent works, including Noroiya Shimai Yoyo to Nene, Noroiya Shimai Plus, and Noroiya Secret. The series also includes the spinoff Noroiya Kemono Karu.

Hirarin’s most prominent credit in anime is as the original creator for the 2013 theatrical film Magical Sisters Yoyo & Nene (also known as Majokko Shimai no Yoyo to Nene). The film was produced by animation studio ufotable and directed by Hirao Takayuki. While the screenplay was written by Hirao, Sato Kazuharu, and Miyajima Takumi, the film is explicitly based on the characters and world created by Hirarin, as credited from the Noroiya Shimai manga series. The film received theatrical releases in Japan and internationally, supported by a production committee that included King Records, ufotable, and Tokuma Shoten.

Beyond manga and anime, Hirarin has contributed illustrations to several books written by Otsuka Eiji, such as Character Maker: 6-tsu no Riron to Workshop de Manabu Tsukurikata and Monogatari no Meidai: 6-tsu no Tēma de Tsukuru Sutōrī Kōza. Hirarin also illustrated the picture book Yoyo to Nene to Kaijū no Tane, written by Otsuka, which was published in 2013. Hirarin’s artistic identity is defined by a long-standing collaboration with Otsuka Eiji and a focus on fantasy narratives, most notably the interconnected tales surrounding the curse shop sisters.