Hoshizora no Babylon -Semarikuru Cosmic Sukebe Onee-sans-

The year is 2068 in the Universal Century. - It's an era where men are overwhelmingly outnumbered by women. - The setting is the Ganymede Station near the vicinity of Mars in the solar system. - Our protagonist, Ginga Amanokawa, belongs to the spaceflight department of the academy. - While on a space navigation test aboard the colony ship "Babylon," they are suddenly attacked by a space monster girl - named "Cosmic Race" that appeared from the other side of a wormhole. - These girls, with a humanoid female appearance, have a goal to mate with human males for the purpose of reproduction. - Despite their inexperience, under the command of the ship's captain, the protagonist and the heroines manage to successfully repel the enemy. - However, as Ginga's existence as a "precious human male" becomes known, they find themselves continuously targeted by the Cosmic Race...!?​