What do maid cafe girls do?

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Maid cafés (Japanese: メイド喫茶 or メイドカフェ, Hepburn: meido kissa or meido kafe) are a subcategory of cosplay restaurants found predominantly in Japan. In these cafés, waitresses, dressed in maid costumes, act as servants, and treat customers as masters (and mistresses) in a private home, rather than as café patrons. (wikipedia)