No way they're childhood friends but she mentioned that they weren't that close and that they only met a lot lately also there is nothing nice about him, he's such a tsundere and not in a good way, also compared to this ML he is absolutely nothing imho
Her answer when ML asked about him is childhood friend but when I say that he nice I mean he still keep up with the sign language. Learning some language is very hard when you not using it so I just respected him. I also understand you tho that he not THAT nice but a lot of childhood friend in other manga are soo niceee
Its always feel so sad when its come to childhood friend and im not ready for it. I means that childhood friend is nice too but when its come to love. Its not the matter of who is nice and nicer. I hope that friend will move on in no time. ╥﹏╥