The story is set one hundred years into the future. Forty years have passed since the discovery of parallel universes (multi-universe). And globalization, as well as science and technology, continue to advance. The protagonist, Tomoe, makes a living out of chasing criminals as a bounty hunter. But due to information from Kira Seishiro - an administration bureau member of public security transfer - in order to save her endangered self on another Earth, she departs on a journey throughout the multi-universe.
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