Short answers, pulled from the story.
Final Fantasy Legend II is a 1990 Game Boy role-playing game developed and published by Square. It is the second entry in the SaGa series, known in Japan as SaGa 2: Hihou Densetsu. Square marketed it under the Final Fantasy name in Western territories to capitalize on brand recognition.
The soundtrack was co-composed by Nobuo Uematsu and Kenji Ito. Ito, a newcomer to Square, wrote half the tracks while Uematsu was simultaneously working on Final Fantasy IV. A compilation album, All Sounds of SaGa, featuring music from all three Game Boy SaGa titles was published in 1991 by NTT Publishing.
Final Fantasy Legend II sold 850,000 copies by 2002, making it the second best-selling title among the Game Boy SaGa releases.
Yes. SaGa 2 Hihō Densetsu: Goddess of Destiny, the Nintendo DS remake, was released on the 17th of September 2009. Production began in 2007 and the remake remains exclusive to Japan, though a fan translation was developed.
The Game Boy original was re-released on the Nintendo Switch on the 19th of December 2020 as part of Collection of SaGa: Final Fantasy Legend, marking the first time the titles reached Europe. Android and iOS versions followed on the 22nd of September 2021, and a Microsoft Windows version launched through Steam on the 21st of October 2021.
Akitoshi Kawazu directed Final Fantasy Legend II and went on to direct Romancing SaGa for the Super Famicom, released in 1992. He also directed the 2009 Nintendo DS remake. Final Fantasy Legend III, produced by Square's Osaka studio in 1991, was the only SaGa title made without Kawazu's involvement.