What I'm glad about is that Yokoi also has his demons he's fighting as well.
If it was all Megumi that had scars, both literal and metaphorical, and monster she had to overcome, it would feel too one-sided.
I think that because Yokoi isn't perfect and also has his own internal struggles and trauma he has to surpass, that it strengthens him as a character.
It also makes it clear why we only ever see Yokoi talk about his father, or only has his father over. I'm assuming his mother was abusive towards him and they split at some point, and the father got custody, despite some faults on his own part. There's a lot you can infer about one panel given the context around it and what you see, and that's some damn clever writing.