Question about Innocent World boots sizing

I just found these adorable IW boots in an online shop, but I'm not sure about the sizing, so I thought I'd ask here if someone who owns these boots could help me out. They are a size S, which is called "23,5 cm". This is more or less my foot length, so they could fit, as long as this is the true insole length, or better the recommended foot length for this size.

Does anyone own these boots in size S or M and could measure the insole length for me, please? Thanks a lot in advance!