Yukio Returns

Suddenly one day, Nao and Miki loose control of their abilities as wind handlers. The wind suddenly starts to blow harsher and they begin to feel euphoric. When finally the woman doctor in the nurse's office starts to create wind, the reason becomes apparent.
It was Mr. Taiki's older sister-in-law, Yukio. She had arrived in town. She says she was just on her way back from her friend's wedding. What could be the real reason for her arrival?
And the time that Nao and Miki become adults is definitely coming closer.