Japonais just spent 1,5 years in France before joining Les Marquis. Getting papers in France isn't that easy. There are alot of people that live more than 20 years in Paris, but have no papers. It also for these reasons that some Congolese people decide to go elsewhere in France (Normandie, Bretagne, Aquitaine, etc.), because there it's easier to get papers
There are different musicians that do interviews or play at Djonga or other nightclubs/restaurants, but are homeless and sleep at different places
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