Hiromichi Satou has been single his whole life, but, he recently got a girlfriend named Saikawa Haruka, and they have been dating for a month. His father remarries, and he gets a new step-sister Saikawa Shigure, the identical twin of Haruka. Sato and Shigure agree to keep their step-sibling relationship a secret from everyone, and Haruka. How will the story unfold?
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