Responses
abt ch.4
–as he was was shocked when he came to his hair salon.
Conclusion : There's this huge possibility that Itsuki is the kid whose the only one who stays in yuuhi's side in childhood.
It also explains why his face is the only one that aren't scribbled in his mind.
(this is only my opinion)
1. yuuhi remembers someone celebrating his birthday ( is the one with loose clothes and long black hair that gave him candy) when his parents didn't even try to. That person, the child with long hair was the only kid who plays with him despite the bullying.
2. Itsuki flashes back again to his past showing him self sitting near the walls with loose white clothes and long hair.
He said there's this one friend in his childhood that he reallly cherish in his memories, even though it's only a short time.
(From his backstory he's probably malnourished? Or not well because his mother is abusive/ ill ? Idk)
3. It's confirmed at the last page that itsuki isn't the culprit behind the bullying from the moles placement, and he seem to know this guy who apparently bullied yuuhi