The story
JAST USA was so named because it was originally affiliated with JAST (the Japanese company), but with the closure of JAST in 2000, the company created the subsidiary Peach Princess (because there was no longer a JAST to be affiliated with). As Peach Princess, the company published mostly Crowd and Will titles. In 2005, JAST acquired G-Collections from CD Bros., as it left the US market. In 2006, JAST USA merged its subsidiaries as JAST USA brands. In 2011, the brand JAST Densetsu was created with the goal of separating visual novel games from the image of dating-sims.
In 2015, all brands were folded back into the parent company, JAST USA, to improve overall brand recognition in a market growing more competitive. In 2018 during Anime Expo, its newer branch called JAST BLUE, which focuses on boys' love games, announced license acquirements of Nitro+chiral's titles Sweet Pool, Lamento: Beyond the Void, Togainu no Chi, DRAMAtical Murder, and Slow Damage.
From Wikipedia’s article on JAST USA, shared under CC BY-SA 4.0.4