Rebecca imagined many things after finishing Universtity, dying was not among them.
Being reborn as the twin Sister to a different worlds Hero and dealing by default with his opponets certainly wasn't what she imaginated eighter.
English is not my first language so there will be mistakes. I will try to avoid them but make no promises.
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The world this story is playing in and the characters that are in the original story all belong to Tang Jia San Shao.