[1] Working for Sega's development division, he programmed arcade games including Ninja Princess, Alien Syndrome, and Choplifter.

[2] Joining him at AM1 were members of Team Shinobi, who had developed Alien Syndrome and the arcade version of Golden Axe.

The team used 3D computer graphics for the first time in 1994's Wing War,[2] a game that would also be released for Sega's R360 arcade cabinet.

[10] Nakagawa has stated that he considered it good that AM1 did not have a specialty area and could develop almost any game as long as it was fun, and highlighted Wakuwaku Anpanman, a kiddie ride, as an example.

[12] In April 2000,[13] Sega restructured its arcade and console development teams into nine semi-autonomous studios headed by the company's top designers.

[17] As part of the mergers, Wow Entertainment merged with Overworks,[18] formerly Sega's AM7 department and headed by Noriyoshi Ohba.

While no official reason for his departure was given, it has been suggested that Nakagawa's resignation could have been due to a desire not to comply with Sammy's demands.

[20] Kazunori Tsukamoto, who had worked on The House of the Dead and Super GT, replaced Nakagawa as president of Sega Wow.

[21] As Sega Wow, they developed Finny the Fish & the Seven Waters with Sony Computer Entertainment, Blood Will Tell and the 2005 Altered Beast game.

[25] Prior to the acquisition by Sammy, Sega began the process of re-integrating its subsidiaries into the main company,[26] which was completed by October 2004.

It was led by Noriyoshi Ohba,[35] who was initially hired to Sega's CS2 department as a planner and worked on titles such as Wonder Boy in Monster Land and Clockwork Knight.

[37] CS2 R&D had a hand in the development of Sega Saturn games, including Sakura Wars,[35] Deep Fear, and J-League Pro Soccer.

Games released for the Dreamcast as Overworks include Skies of Arcadia, Sakura Wars 3: Is Paris Burning?,[37] and GuruGuru Onsen.

[39] After the discontinuation of the Dreamcast, Overworks continued to work on Sakura Wars 4: Fall in Love, Maidens and a sequel to Shinobi, before being consolidated into Wow Entertainment.