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-https://en.wikipedia.org/wiki/Sin_%26_P ... _SuccessorTaking place many years after the original Sin and Punishment, Star Successor reveals that there are two dimensions present within the universe: Inner Space and Outer Space. The leaders of Inner Space, known as the Creators, created and cultivated several Earths populated by humans to defend against Outer Space. Whenever humans stray from their intended path by attempting to bring peace, the Creators wipe them out and create a new Earth. Outer Space sends a reconnaissance unit in the form of a human girl to investigate humans. However, in the process of infiltration she loses her memory and wanders to the ruins of Earth-4 instead of the human-populated Earth-5. An agent of Earth-5, Isa Jo, is sent to find and kill the Outer Space infiltrator, but after observing her he concludes she is harmless. Naming her "Kachi," Isa decides to protect her. In response, the Creators send out a group known as the Nebulox, led by Isa's former ally Deko, to tell Isa that Kachi is a monster capable of destroying entire worlds, and that he must destroy her. When Isa refuses, they try to kill both Kachi and Isa for his betrayal. The "Keepers," lifeforms which have worked to destroy any supposed contaminants to Earth-4, attack humans and invaders.
Isa goes on the run with Kachi, seeking to board an air ship that will take them off the planet. Isa and Kachi's attempts to escape are thwarted by the Nebulox until they eventually decide to face them head on. Isa changes into a ruffian form, an ability he inherited from his father, Saki of the original Sin and Punishment, but he merges with Kachi in order to control his new power. They pursue the Nebulox into space, killing them one by one.
When the game is completed in Isa and Kachi mode, a final scene shows Kachi's memory returning. She reveals to Isa that her real name is Achi, implying that she is actually the villain from the original Sin and Punishment, and that Isa's decision to protect her from the Nebulox was a mistake after all.