...Which I couldn't find anywhere.
I could post a recording with how the lines were sung.
It starts with
(something something) を負い続く
This is part of the first line of the song.
The end of the chorus goes:
こんな弱い私なら、ビェビェ (ビェビェ is sung much higher than the rest of the line)
The artist is either Hako Yamasaki or someone with a very similar voice.