Way back when...
...remember Child's Play? Of course. Let's dredge up those memories, because here is another lovely tanka to consider:
and untying a ribbon--
why could I tie it
so well before?
This poem brings to mind the loss of innocence. It also has other, more concrete parallels--the ribbon in the poem and the new hairstyle Midori must wear in the story.
This trying to do something that one could do before with ease...well, to me that sounds like some sort of change happened in the individual. A certain loss of grace and poise comes with the onset of puberty; that gawky, awkward, liminal phase. This is what occurs in Child's Play, isn't it?