Leo Barraclough International Features Editor Tennis champion Naomi Osaka’s company Hana Kuma has boarded Leonardo Van Dijl’s debut feature “Julie Keeps Quiet” ahead of its world premiere on Saturday in Cannes Critics’ Week. The film is being sold by New Europe Film Sales. Osaka and her longtime agent and business partner Stuart Duguid’s Hana Kuma, an Emmy Award-nominated creative house, will serve as executive producers on the film.