I'll be the holdout with a hot take in here. I still don't believe the main girl is a tsundere and not an ice queen kuudere. Ayano is an outwardly cold, quiet and aloof kuudere and this is a hill I'm willing to die on. Come on, she's got a fairly stoic face in here and tsunderes
do not have a monopoly on blushes.
I'm convinced the main English title is a mistake, especially since the original JP title does not have any mention of "tsundere" at all. It's my guess that "Tsundere" Childhood Friend is a misinterpretation from one of the scan groups that liberally translated the title.
The translation of part of the title "
Shiotaiou na" into "Tsundere" does not work for me.
A kuudere can be equally cold, unwelcoming and harsh, this is by no means limited to tsunderes.