She is the human soul locked in a spiritual shell
when she first came into the world, in the human world, her family decided to get rid of her, leaving the baby near the cursed forest
her small fragile body could not resist the frost,
and wild birds helped to get rid of suffering by tearing her mortal body
all that remains of her is a strong human soul, which was noticed by a reaper-cat from the world of spirits- Sobu
she took under her care this little soul that had not seen life
mother cat brought up and raised yumi, not without difficulties of course nvn’

perhaps the text is clumsily composed, sorry, english is not my native language
but I hope you at least a little understood who Yumi is ^^