I randomly binged the manga, this is just a 3/5 star manga. The beginning had potential as it's clear the MC is a live or die assassin from head to toe. The regression was haphazard but the setup had a more intimidating feel to it? Sadly the development/story become weaker due to inconsistant pacing, jumpy events, and a confusing MC. In the earliest chapters, at the age of a child, she doesn't hesitate at all to kill people (even at her kid age.) This could work in certain context situations, but here it wasn't done properly. She just easily accepted and decided to kill a family of nobles causing"trouble." Yet it was never clarified what they were doing, so...she must murdered them without properly thinking, investigating, or learning why?

That's terrible, and I get she's obtaining a human heart but it's so wish washy I am having a hard time getting into this series.