The very first moment I saw the page I knew it: Aoyama Gosho. There was no way I was mistaken and for real, it was a One Shot by him!^^ Yay. His drawings are worth the read. I am impressed by his style. There are few mangakas who are able to draw every manga similiar. It's distinctive.
The One Shot was rather shorto but I think it's typical for Aoyama Gosho. I wasn't impressed but he didn't disappoint me. All in all, I was pleased with it.