The didactic poet Henry More took up the classical theme of Cosmic pluralism of the Greek Democritus in "Democritus Platonissans, or an Essay Upon the Infinity of Worlds" (1647).
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Camille Flammarion (1842-1925) who lived in a time where biological science had made further progress, made speculation about how life could have evolved on other planets in works such as La pluralité des mondes habités (The Plurality of Inhabited Worlds) (1862) and Recits de L'Infini(1872), translated as Stories of Infinity in 1873.
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In the game's back-story, a species of powerful, unknown extraterrestrials enters the Milky Way with the intention of enslaving its inhabitants.
Yorozu Genkurou, a samurai who managed to acquire the sword called "Taitei no Ken (The Sword of Alexander)" soon realizes its true potential as he battles ninjas and aliens that covet his life and sword.