In the 21st century, humans began to develop the universe. However, the attack of cosmic creatures (commonly known as Space Monsters, STMC), a type of creature that reproduces on stars as carriers, has posed a major threat to human civilization. In order to fight against the space monsters, robot weapons and space battleships continue to be developed, and the robot training schools on the earth will find the best pilots to control them. In 2015, after coming into contact with space monsters for the first time in human history, the heroine of the story, Noriko Takaya, entered the robot training school for training, piloted the Gunbuster, the strongest weapon for humans to fight against space monsters, and began the story of her mission to protect the earth.
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