wdym "others cant see me" and "ive always been like this"

I think they just don't remember that he's an angel, but he's a close friend to both of them.

i don't understand the angel situation
has he always been an angel and was just living as a human or did he turn into one after the accident and how was he able to interact with ppl and have them see him while ren was also an angel and couldn't be seen

It seems he was always an angel

Haruna was always an angel and people was able to see him when he didn't do things that angels do like fly, about Ren , it's more like he wasn't an angel but a soul between life and death so no one could see him but to MC he was like an angel, that how MC saw him, that what I think...