I've spent enough time trying to find the exact magical circle Rumiko referenced in Rin-ne. I think I am going to skip this one. It presumably is fairly close to its source, given that it has text on it. And yes, the text used English letters in the original Japanese as well.

September 4th, 2013. Author's note:
"Q: "I'm really sleepy!" Tell me how you deal with this!
A: I drink Frisk at work."