Reigens shoe size. (Yes I'm okay.)

So, since no one else (that I can find) has calculated his foot size, I decided to. I was also inspired by a period pad. Please excused my bad math, but I got a rough 23 cm in length. I did this by getting a few screenshots and measuring his forearm multiple times and averaging it to the previous mentioned number "23". It of course is VERY rough, but it's a fun thing to know I guess? From my very lazy google search hes a size S in jp shoe sizing, 6.5 us, 7 aus. But take all of this with a grain of salt.