>>>Spoil<<<
I couldn't remember this particular manga :
Main male (middle age) told story of a girl who had nightmare and lost weight to the point of nearly die.
Story progress that she had develop this presence personality because trauma from the past.Her parent die or something.In the past she try to suicide but not success.

Finalty she cured but this presence personality is gone for good,so she return to had a mind of little child (with around 20yr old body) and she forget main male.

some keyword : what worse than dead is can't dead.(or something along this line)

So anyone remember this manga name?
Thank in advance.

maybe Shi ni Itaru Yamai?

Yes,it is.
(Even it is in my complete list all along but I couldn't find it)
Thank you.