Katakana on a Chinese food truck? I don't think so. 

Hiromi wouldn't have a tattoo. Japanese who aren't Yakuza avoid getting tattoos because they don't want to appear to be involved with them. Hiromi also has even more disgust for the Yakuza than the average person. Most Japanese women don't have a large number of piercings (especially visible ones), due to their modest nature. Why the hell does she have the kanji "Musha" tattooed on her belly? She isn't very warrior-like.

In the second chapter, the English gets really weird. Things like going going off the park and hide in her laptop occur much more often. The sentences often are hard to understand and women are frequently referred to as "him", making for a very confusing read.