I remember the girl being a quiet 6-7 year old who was clingy and highly reliant on the guy.
the girl looked exactly like the guy's ex who either died or left him years ago which is why the guy was so attached to the little kid.
It wasn't a comedy manga by any means, it was more like a slice of life or psychological themed story.
As far as I had read, there wasn't anything sexual or physical between the guy and the little girl (wasn't a loli manga) but the two were really close and the guy didn't want to get into a new relationship because he kept thinking about her.
He was raising the little girl as his own child.
The girl kept wanting to look older and more mature so she used to steal make up and high heels to get the guy's attention
That's pretty much all I remember and the manga was a chaptered one so no one-shots