Genuinely my favourite song of all time. First listened to it in FMAB - and this song will be forever be special to me because of that. But even on it's own, it is an absolutely transcendent piece of music. Never have I listened to something that feels like an emotional odyssey, while being 3 minutes long... utterly perfect production that layers violins upon what would be a more standard J-Pop song, and a vocal performance that feels like almost like catharsis.
My favorite anime ending theme of all time. Don't get me wrong, there are a lot of ones that come close but this is the only one that has genuinely made me ugly cry every time I hear it. Combine it with that incredible animated ending sequence and I just want to kill myself every time. And it's literally Brotherhood's very first ED, talk about emotional torture.