A family who believed there were once seas on the moon.

Paris, 1932.Reinoshin, a Japanese man, and Louise, a French woman, meet in their usual coffee shop. They never speak to each other, but always feel close to each other. One day, Reinokin approaches Louise and tells her that he has to leave France.

A damaged spaceship arrived on a small planet. The crew, having made an emergency landing on an island on the planet, decided to explore it. Gaji, a member of the chemistry research team, set out to join the expedition but was caught in a storm and, before he knew it, had washed up on an island. There, he met a blind woman who introduced herself as Yuki.