Finding out by accident from kids in the know is pretty common. The absolute worst way is someone being an asshole and telling a kid deliberately out of malice.
But still, poor Class Rep. I hope she managed to keep believing anyway.
Mutters sounds like an interesting game. I'd love to try it out, someday.
Hiiragi and Taiyou don't have telepathy, yet they perfectly understood each other? Taiyou's smarter than I thought! Or maybe he really is hiding something.
Too bad for Sakura and Akane though, their secret signs couldn't beat Taiyou's raw skills!
But hear me out. Based on the frequency of various supernatural phenomena just casually walking around in their world, that actually very likely means Santa is real over there. I'm sure Momozono-sensei would agree with me if she were there. Maybe Akane will get her revenge in a Christmas chapter.