[jeffp]

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 discussing stuff:

I think she just wants to be normal. Like earlier in the series how happy she was when they asked if she wanted fries, or how she was excited about the job to get money to buy Yui's guitar. She may not need the money, but she likes the experiences.