In 2071, with the realization of superluminal navigation technology, humans were able to move conveniently within the solar system. However, due to design errors, this technology caused the explosion of the moon, and countless lunar fragments were attracted to the earth, causing an unprecedented disaster. The surviving humans fled the earth and began to build homes in various parts of the solar system. Due to this disaster, national governments and other power institutions were extremely unstable, and public security issues became a problem. Some organizations began to allow individuals to capture wanted criminals in exchange for bonuses, which is the "bounty hunter". Spike and Jet are bounty hunters who drive the spacecraft BEBOP in the universe to capture fugitives and get bonuses. During their interstellar journey, the two met the beautiful woman Fei, who was in huge debt and loved money, and the computer prodigy Ed, and adopted the data dog Ein with a high IQ. From then on, the four people and one dog wandered in the vast universe, experiencing all kinds of joys and sorrows in their own and others' lives, and also looking for their own past.