Gradius II was released in March 1988 in Japan.
The title of this game translates from Japanese as 'Gradius II - GOFER's Ambition'.
This game is known outside Japan as "Vulcan Venture [GX785]
A three-part Ova anime based on the Gradius series was released in Japan within a year after the release of Gradius II. It follows the adventures of Dan, Stephanie, and Eddie - Three ace pilots who hope to save their planet from the forces of the Bacterion empire. Later on in the series, they are joined by Lord British, the Prince of Latis.
Apollon Music released a limited-edition soundtrack album for this game (Space Odyssey, Gradius II - Gofer no yabou - BY30-5202) on 21/07/1988.