Mayu told her brother that she wants to challenge herself by playing overseas. It was from an Italian article about Yuki a year ago. I don't know how that would work out for her since she's too short. I doubt she would settle for just any club just to play outside of Japan.
The Japanese players will benefit on overseas experience but I agree. I wonder what club Mayu can play on. Acharaporn and Chacho on were not far from her height though? And they're in Turkey. The only one with foreign contract among them is Inoue. I'd love to see Koga in EU too