Short answers, pulled from the story.
Enix was founded on the 22nd of September 1975 under the name Eidansha Boshu Service Center. The company initially operated as a publisher of tabloids for real estate advertising before pivoting to the video game market.
Yuji Horii, Koichi Nakamura, and Kazuro Morita won the Enix Game Hobby Program Contest in 1982. These winners went on to shape the landscape of video games and collaborated to create The Portopia Serial Murder Case in 1983.
Enix launched the Gangan Comics imprint family beginning with Monthly Shonen Gangan in March 1991. This expansion included other manga imprints such as Monthly G-Fantasy and Monthly Shonen Gag-OU.
Enix merged with Square to form Square Enix on the 1st of April 2003. Enix remained the surviving corporate entity while Square dissolved its departments and subsidiaries into the new company.
Enix published its first third-party console title ActRaiser for the Super Famicom in 1990. The game was developed by Quintet, a Japanese independent developer made up of former Nihon Falcom staff.