The ending between the two of them is fine, not great but fine.
The only part of this that left a bad taste in my mouth was the model girl just getting tossed aside when it seemed like she only wanted a friend.
People have been saying it in this thread but... Having just read all of it in a row I really hope Liz and Miyabi don't end up together.
The "romance" tag has been there the whole time but absolutely nothing about their characterization or their relationship feels romantic between them. Hell...
I don't know why I ever expect a manga to do something unique. Or at least not follow the mould this strictly. You could see this part coming from a mile away.