This is one of my favorite one-shots. Rather than try to tell an entire romance story in a few pages, it shows, rather than tells, conveying a great deal of information in a few pages and no dialogue.
Because the story shows, rather than tells, there's a lot of room for interpretation as to how much the NEET changed her life(wearing the suit implies she got a job or is at least going to interviews), and how much she just did it to impress her girlfriend. The NEET could be shocked that her girlfriend isn't how she first seemed, either- the girlfriend is more well-dressed in the prior pages than she is in the final one(with the exception being their makeout session on Page 4).