Nouns ending in -tion are feminine.
The suffix forms abstract nouns of action or state.
Is science-fiction masculine or feminine?
lascience-fiction
The rule behind it
99.8% of -tion nouns are feminine
In context
J'aime lire de la littérature de science-fiction.
I like reading sci-fi literature.
Est-ce que tu aimes les films de science-fiction ?
Do you like science-fiction movies?
Certaines personnes associent la science-fiction avec les Japonais.
Some people associate sci-fi with the Japanese.