It Was
This is the song I discovered and listened to constantly when my first love broke my heart. The lyrics are like a perfect match with what happened in my life. Also, it felt like my own little song, because it didn't get any attention from Ayu. no single release, no PV, no performance, nothing. It kinda feels like nobody but me knows about this song, which made it even more special.
(It's of course completely false, since everyone on this board knows and probably loves this song, but that's not the point
)