Unfortunately that seems to be the case. I don't know all of the details but both the manga and light novel end inconclusively. The ending is cute enough and I have more appreciation for it now then when it came out. I think if it had 4 more manga volumes (so probably 2 light novels), it...
The merchant guy walked away to go grab something and Shion felt the presence of others but because manga, was cryptic about it until the last page. He was announcing to Ibris that the merchant returned. There's probably a more intuitive way to translate that. The line in the RAW was...