Say it/Itte is about a girl in the MV who has recently lost someone and you can infer that they told her that they were going to commit suicide and while at the time she doesn't think much of it while after a while she wishes they said it more clearly hence the title say it. What i do like about it is the representation in the MV (Music video) of her looking over high places such as tall buildings , ledges almost questioning why would anyone do such a thing and jump. You can also see her guilt and fear symbolised as a black shadowed creature almost following her around. Her carefree attitude at the beginning (Look, about that thing you said ,I didn’t feel like thinking about it too much, So I had forgotten about ) can also be interpreted as self loathing because while at the beginning it seems she doesn't care as it progresses you can see that she truly see how she blames herself and at times alternates between accepting the fact that her love is dead and denying that she's dead. Each use of the phrase say it links to a different mean;
"At least give me a hint before you kill yourself" (言って -> Say it!)

"How to explain to you how beautiful it is be alive before you die?" (逝って -> You're dead)

"How to sing about love on the last day of my life without you?" ( いって -> a sound you make when you're hurt).
One more thing is the visual of her repeatedly descending down stairs. While at first it just looks like playful fun at second thought it could also symbolise her descent into depression, going further and further as the song goes on. Everything from the monotone pre-chorus and my personal favourite the last say it at 3:56~!!~ where her face goes sad supports this.

This also links to the complex relationship between Elma and Amy which i have yet to get into however the base overview of their relationship provides more context to the sadness as their relationship is truly deep.

Conclusion:

This is my of my old favourites and the first song to get me into yourushika hence why it is my first review. While it does strike a chord with most people, I personally don't relate to it as i do other songs by yorushika, The feeling of guilt of someones suicide can truly be a detrimental feeling and this song lets you know that its normal to grief and feel guilty.

Lyrics for context,
Say it

You see, I’ve actually realized already
Look, about that thing you said

I didn’t feel like thinking about it too much
So I had forgotten about it, but

Living blindly, recklessly, delusionally
Impulsively, impatiently, negatively didn’t do me any good

I’m sure that on the last day of my life, when I think of what’s gone before
All of it, all of it will be unspeakably precious, but

Ah, on that last day of my life, you won’t be there–
More, more, more
Say that more clearly

You see, I’m not sure how to tell you that the sky is blue
Or what I’d have to do to make you understand that the clouds at night are high

Say it

You see, I actually know
That you’re already gone

You see, you’ll probably just call me obstinate, and I want to forget, but

Say it more clearly
Make a note so you don’t forget it
Let’s meet tomorrow at ten on the train platform, or something like that

Even if its petals scatter, a peony is still a flower
Even if the summer ends, the memories of it are still cherished

Put it into words, give voice to it
Say it

And then if I could see you on the last day of my life

I’m sure, even on the last day of my life, that I’d sing of love
Because you’d tell me none of it, none of it was in vain

Ah, I still can’t believe that on the last day of my life, you won’t be here

More, more, more, more
More, more, more, you have to
More, more, more, more

Please, say it more clearly