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Lively and cheaper than Montparnasse
Shiawase is a Japanese restaurant in the south of Paris, near Pernety métro station (line 13). It's lively and cheaper than Montparnasse, if you with friends one night you'll find it very nice. It's discrete with a facade that's barely noticeable. They serve sushi, various menus of Japanese cuisine, the fish is very fresh and it's cheaper than the other Japanese restaurant next door. They are friendly and sometimes offer a digestif/snack.