[SEChronaFan]

Originally Posted by klare

this is really a "special" episode... nothing important happened, overall its a light and easy extra eps

Spoiler for it does not explain:

why Mugi wants to work part time, she is from a rich family...

and thanks K-ON!

Spoiler for possible explanation:

I don't think it's about the money for Mugi, it's living the lifestyle of a more normal person. She gets thrills from the simple things, and this job is one of those.