This was a long time ago so I only remember pieces of it. It might have been a one shot.
A single mother tries to raise her child but when it becomes too difficult to support the both of them she abandons him in their small room to die. The child reincarnates in various forms (one of it was a...
their relationship's progressing a lot further than it ever did in the pre-serialization, so I don't think we can use that as the basis for this one...