Yoh meets Tsukiko as a small child when he drops his telescope. In the present, he no longer is living in Japan. His father, an astronomer, is pitching a lecture series to an American college, and plans to travel there with his wife and son. Yoh asks if, before the lecture circuit is approved, if he can spend time back in Japan. His father realizes that this about the girl that Yoh had met long ago, and grants his approval and support to find his own "first evening star." Yoh goes to a school focusing on astronomy, where he quickly meets Tsukiko again, who is the only female student at the school (thetvdb.com)