Short answers, pulled from the story.
The company that became NBCUniversal Entertainment Japan was founded in March 1981 by Pioneer Corporation as LaserDisc Corporation, originally to manufacture LaserDisc players in Japan. It took its current name on the 9th of December 2013.
NBCUniversal Entertainment Japan has produced anime series including A Certain Magical Index, The Heroic Legend of Arslan, Danganronpa: The Animation, Golden Kamuy, Seraph of the End, and Is the Order a Rabbit? among others.
No. Despite the name, NBCUniversal Entertainment Japan does not handle theatrical distribution of Universal Pictures films in Japan. Toho, through its Toho-Towa subsidiary, exclusively distributes Universal Pictures films for Japanese theaters.
Japanese advertising firm Dentsu owned the company from the 21st of July 2003, when it acquired the company and renamed it Geneon Entertainment Inc. In November 2008 Dentsu announced the sale of 80.1% of its stake to NBC Universal's Universal Pictures International Entertainment.
On the 12th of July 2017, NBCUniversal Entertainment Japan announced a partnership with Crunchyroll to co-produce anime with international appeal.
Since the 1st of July 2025, Happinet has been the exclusive manufacturer and seller of NBCUniversal Entertainment Japan's home video releases. That same arrangement led NBCUEJ to end its Japanese home video distribution of Paramount content the day before Happinet's exclusive deal began.