And, purchased by me from the bakery in the Marukai in Gardena:

So choco coronets do exist.

However, I'm going to assume that Konata's are larger than this. At barely 3" long and less than 2" wide at the big end, it's barely a snack for me, much less lunch for a teenager.

Maybe that's why she's so short. I mean, if a small chocolate-filled pastry is all you eat for lunch on school days....