The story begins with Earth's northern hemisphere submerged due to a massive subterranean earthquake, and three tyrannical despots oppressing and exploiting the populations. The player takes on the role of a SeaBlade pilot, sent to liberate the oppressed, crush the tyrants and investigate an unknown power.
SeaBlade features fast-paced arcade shooter action, with quick reflexes and sharp instincts required to survive against enemy forces. With multiple levels set in different environments, from lush jungles to ancient ruins, players must use their skills and tactics to overcome the odds and emerge victorious.