Spoilers
This chapter actually met my expectations of the manga going in. Sure, the artwork is cute and might seem disarming, but even from the cover, I got the feeling that things might be more bleak than the art shows, wuth that overgrown 止まれ sign giving some hints. Odds are very good I am going to have no self control and I’m going to finish the manga this weekend. 
I had never heard of wabun as a code system, but when I saw the 4 symbols, my assumption of what 4-kana combination was likely in that situation ended up bearing out. As soon as I looked up the chart and saw the first kana was what it was, I had a little bit of pride that I assumed correctly.
Definitely an intriguing manga, and I’m all on board with it!