Don't ask why, but I'm looking for the songs with this kind of content - old, sad memories or smth that is painful but at the same time happy when we remember it. The lyric has to have a subject of sad or cheerful memories.
Just like:
Omoide by Morning Musume
Don't recommend me anything by Ayu, Hikki, BoA, Namie...
Can someone help me out?

Thanks in advance!