Possivelmente, " Frost and Fire " , de Ray Bradbury.
Aqui estão alguns trechos de resenhas on-line:
When a ship, known as a seed, crash landed on the planet ten thousand days ago, it resigned the people to living in the cliffs, the only place they were safe from the sun where it was so hot it could burn them, and the nights were so cold they could freeze.
Isso menciona o personagem central e o curto tempo de vida de seu povo ...
The plot follows Sim, the protagonist of this story, and his apparently short life on a planet where people are cursed by radiation to live only eight days.
E isso fala sobre a breve janela de tempo disponível todos os dias:
The only time of day they can leave is dawn and sunset for only an hour, where they can gather food, and enjoy the outside.
De outras fontes, aqui está uma menção da menina:
Lyte is the girl he has chosen to marry. Together they try to discover the secret that might save them and their race from this unfortunate cycle.
~ Editado de Wikipedia e frostandfirerodriguez94 e teatromania
Ouça uma reprodução de rádio antiga (link alternativo aqui ) adaptado do livro. Há também a novela gráfica mostrada na parte superior.