Short answers, pulled from the story.
Hobby Japan is a Japanese company that publishes books, magazines, light novels, and games, and distributes collectibles including action figures and diecast car models. Its publications include Hobby Japan EX magazine and Uchusen. The company also releases translated tabletop roleplaying games such as Dungeons and Dragons and Warhammer Fantasy Roleplay.
Hobby Japan was founded in 1969. It is a Japanese publishing company with a catalog spanning magazines, light novels, anime productions, roleplaying games, and diecast models.
Hobby Japan translated and released Dungeons and Dragons 3rd, 3.5th, and 4th editions, as well as Warhammer Fantasy Roleplay 2nd edition. The company also produced original roleplaying titles, including Ring Master I: The Shadow of Filias in 1989 and Ring Master II: Forget You Not, Evermore in 1990, both for the X68000 home computer.
Hobby Japan has produced anime including Queen's Blade, Hell Girl, Demon King Daimao, Hyakka Ryoran Samurai Girls, Seven Mortal Sins, Aesthetica of a Rogue Hero, Infinite Dendrogram, Invaders of the Rokujyoma!?, Seirei Gensouki: Spirit Chronicles, and The Master of Ragnarok and Blesser of Einherjar.
Hobby Japan produces diecast models of Japanese domestic market vehicles, with a strong Honda focus including multiple Civic variants, the S2000 AP2, and the NSX. The lineup also includes Toyota, Lexus, Subaru, Mazda, Mitsubishi, and Suzuki models such as the Mazda RX-7, Mitsubishi Lancer Evolution, and Subaru Impreza WRX STI.
Hobby Japan operates two light novel imprints: HJ Bunko and HJ Novels. These labels give the company a direct presence in the Japanese light novel market, which frequently generates source material for anime and game adaptations.