Japan Shoe Size Conversion

Yesterday I bought a shoe in corner shop, near the SEGA store in Saijou, Higashi Hiroshima City. I just a little bit confused when I see the size number of those shoes. Those are not so familiar number.  Soon a while, I check in internet, and there are a conversion table, which i s I think it might be so useful for you.

Adult Mens and Womens Shoe Size Conversion Figure

If you Europe’s shoes size number is 41 and you are men,  so in Japan it is converted to 26.5.

It is a little bit funny, why they separate the shoes size for men and women?