From Wikipedia: Star Cruiser (スター クルーザー Sutā Kurūzā) is a role-playing first-person shooter video game developed by Arsys Software and released in Japan for the PC-88 and Sharp X1 home computers in 1988. The game is considered innovative and ahead of its time, for being an early example of an action role-playing game with fully 3D polygon graphics, combined with early first-person shooter gameplay, which would occasionally switch to space flight simulator gameplay when exploring the open-ended outer space with six degrees of freedom. All the backgrounds, objects and opponents in the game were rendered in 3D polygons, many years before they were widely adopted by the video game industry. The game also emphasized storytelling, with plot twists and extensive character dialogues, taking place in a futuristic science fiction setting.
Source: Wikipedia, "[en.wikipedia.org/wiki/Star_Cruiser Star Cruiser]", available under the CC-BY-SA License.