who, dearest and momentum don't openly talk about death, even if they are dedicated to someone who died (well, only who in this case) this is the way i see the cited songs...
Who... even if it's speculated to be a song for her grandma who passed away, the song only talk about some beloved one that is far away... in the end it's used as her main fan song:
Duty IMO is about the end of her peak, and the end of her career (considering this album was released at the Dome Tour/A Best year, maybe ayu's most depressing one)
Dearest... the only part that sounds to be about death it's when she says that she wants to remember her beloved's face until the day of her death... what means that she wants to remember it forever, but on a much more dramatic way xD
Momentum... isn't it about someone who broke up with her cuz she did something wrong?
rainy day
End roll... isn't it about breaking up?
Far away... another one about breaking up?
Spoiler:
It's new, it's like me, it's like you...
Back when we still called each other "lover,"
that sea we visited... I went back there alone.
And while searching for that place I had forgotten for so long,
the sound of the waves were somehow soothing;
I think I'm about to cry.
It's new, it's like me, it's like you. I am reborn...
If you try to describe happiness: it's something
intangible that slips through the cracks of your fingers.
You said "I'm leaving to find myself," and left.
In that memory, and others since, the sea grows wider.
Surely somewhere out there the skies we are looking at
flow together, and are connected.
People think of love as a station at which the train doesn't stop.
But we had a departure station and an arrival station.
ul-lalalai Yeah, that's right.
Summer is coming soon. A summer without you...
IMO those are the only really about death:
untitled ~for her~... openly about her friend
Heaven... tie-in for a tragic romantic ninja movie (wtf?! xD)
MA
ever free... is she describing a funeral?
Gosh... ayu really is very dramatic xD