Ok so I am trying to find this ond manga where the fl is from outerspace and she gets swap...

Ok so I am trying to find this ond manga where the fl is from outerspace and she gets swaped with someone from the past anf her real body dies and then she is in the new one where is is resucued by two people but the reson why the person in the orgianl body got killed is because her sister wanted her dead. I think its been updated recently but i forgot to save it and i really want tonread ir so I hope.someone can help!!