Naoki Hisaya

Changing schools is something Yuuichi is accustomed to, due to his parent's profession, and with their recent venture to Africa, he is returning to his aunt's home after 7 years. The time that has passed since his last visit has faded his memories of the people he knew, and the ties that bonded them to him, including his cousin Nayuki. Slowly those people, coincidentally all being girls, find their way back to him. (myanimelist.net)

The first place Nonoka Komiya ever called home as a child was Lake Kiriya City, and she's headed back. Sometime in the last seven years a mysterious saucer appeared hovering over the town, changing everything. (imdb)