Assuming "Tsumugi -2004-" is a 2004 acoustic song about a seamstress named Tsumugi:

Accessing the authentic Tsumugi -2004- experience is notoriously difficult. The original publisher, Atelier Sakura Silver, went bankrupt in 2009. The rights are currently held by DMM Games, but they refuse to re-release the "Uncut Weave" version due to lost source code for the proprietary sound engine.

Your options:

4.1. Narrative structure

4.2. Aesthetic choices

4.3. Production context