Marukawa publishing (丸川書店, Marukawa Shoten) is a major publishing company in the Junjou Romantica series. The company is owned by Ryuuichiro Isaka's family and a few characters work for them.
The characters who are mostly connected or involved in Marukawa are mostly characters connected to couple Junjou romantica.
Also including side story Junjou Mistake and spin-off Sekai Ichi Hatsukoi.
- Ryuuichiro Isaka, his family owns the company
- Akihiko Usami, an author
- Eri Aikawa, a novel editor
- Misaki Takahashi, part-time employee
- Kyo Ijuuin, a Mangaka
- The company is based off the real-world company Kadokawa Shoten, which publishes the Junjou Romantica manga series. The image of Marukawa's building used in the series is based on the Kadokawa Shoten building.