isn't this a repost?

Yes, it is.

I also have doubts about whether this is Akiyama Mio. From what I have seen the artist only does originals.

no train ?

I removed the K-On! and Akiyama Mio tags. This is an illustration for a book called "Headphone Girls: A Pictorial Book".

Pro Tip for future taggers: Not every girl with long dark hair and big tits is Akiyama Mio.

Some are Sakaki.

Hangetsu said:
no train ?

There's a railway, at least.