September 10, 1969
Appeared serially in "Play Manga" (Akita Shoten Publishing Co., Ltd.) as a complete story

On a stormy night, a man comes to a valley where a father, a son and a daughter live all by themselves. The family has not been outside the valley for several generations. His father has explained to the son that they live in the valley as an experiment for future space settlements. Since the man from outside the valley falls in love with the daughter, he gets expelled from the valley, and the daughter goes with him. The world outside the valley that she sees for the first time is...