During YST's run in the late 1980s and early 1990s, countless merchandise was produced by Sunrise Animation Studio and other supporting companies. Some of these included doujinshi, novels, compact discs, and cassette tapes that involve the Troopers in off-screen action (i.e. not shown on television). The most notable off-screen adventures take place within the drama CDs that were released. Four of these CDs center around the four Samurai Troopers that aid "Rekka no Ryo" (Ryo of the Wildfire) in his quest to fight evil. As Ryo is the main protagonist of the series, these CDs take a much closer look at his friends and their backgrounds.