Numbering each pane left to right, top to bottom, the piece follows the following cues:
0:00 - 1 - "Where am I?"
0:05 - 2 "...wait... this place..."
0:11 - 3
0:15 - 4 - Rhea says "Oh no..." just a little before we see what she sees...
0:22 - 5 - And then we see what Rhea saw... I said "Oh no..." too, the first time... T__T
0:36 - 6 - The slight vibrato on the high strings gives me the impression of Buwaro's horrorstruck pleas for his sister to wake up. Poor Buwaro...
0:46 - 7 - "...S-Sakido can't ever wake up."
0:54 - 8 - "Demon's don't come back. Death is perm-"
1:00 - 9 - The strings pause for a moment, giving Buwaro space to cry.
1:06 - 10 - They then join his cries of sorrow, trying as Rhea is to comfort him. Perhaps they are better thought of as Rhea's words, then.
1:21 - 11 - I always liked this cadence I play with the suspended second chords here, I use it a lot. Kinda reminds me of church bells. In this case, I imagine Rhea taking a solemn oath on whatever she believes in to watch over Buwaro. To me, this would be God, so I think of church bells when I take such an oath, hence the musical reference.
1:43 - 1 - The moment of holiness passes, and Rhea gets on to digging graves.
1:53 - 2
2:10 - 3 - This change represents the reverence and grief associated with the last time Sakido's body is seen in the webcomic.
2:45 - 4 - Rhea performs one final act of gratitude and respect in the funeral.
3:06 - "Despite the facts I was told, I felt it was the right thing to do."
3:16 - 5 - They say their final prayers for her...
3:43 - 6 - ...before leaving her in peace.
3:53 - 7 - RIP Sakido Elexion. May Gaia be with you.