Manga by author Kei Yoshiaki

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50 years after the war with aliens.Sumire Ichigaya is 18 years old. To pay off her debts, she works for a company that exterminates space pests. One day, Sumire's daily life changes drastically when she is kidnapped by a UFO! The voice of someone in her head, "space vermin attacking" and even a military company is after her!