There could be a fanfiction named 'The Married Detectives'. In this story, Oreki and Chitanda use their unique skills, Oreki's deductive reasoning and Chitanda's ability to notice details due to her curiosity, to solve mysteries in their neighborhood. Their married relationship adds an interesting dynamic to their detective work.
It depends on your familiarity with Japanese - inspired settings and some of the cultural nuances that might be present in the Cote light novel. But the language used is not overly complex most of the time. The story is told in a way that draws you in, so as long as you have basic reading skills, you should be able to follow along. Also, there are often translations available that are done in a way to make it easy for English - speaking readers to understand.
I'm not very familiar with this specific 'la cote basque 1965 short story'. It could potentially be about the region of La Cote Basque in 1965, perhaps exploring the culture, society, or personal experiences in that area during that time through the medium of a short story.
It depends on personal preference. If you like visual and auditory experiences, the anime might be better for you. It can quickly show you the story and characters in action.
One popular 'cote light novel' is 'Classroom of the Elite'. It has an interesting premise where students are in a highly competitive school environment. The characters are well - developed, and the story often involves complex social dynamics and power plays among the students.
Perhaps a plotline where they go on a trip together. It could be a journey to a place full of historical mysteries. Chitanda's curiosity would be piqued by all the new things to discover, and Oreki would be along for the ride, using his wits to solve any little puzzles they encounter along the way.