for the change at the a cappela part... I hear:
Omoidashite mite zetsubou o kanjita ra
sono te o boku ga tsuyoku nigitte iru tte koto o
this is the only change (in bold) at the end I think ^^ and it's not a BIG change because this part is also in the original lyrics:
Nanda tte koto to
sono te o
Boku ga tsuyoku
tsuyoku nigitte iru tte koto o
so it would be.... (from masa's translation)
If you have a feeling of despair, please remember
that I'm tightly holding your hands.
(right? hehe)
I love you Ayu

*-*