Those sweethearts.
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According to Sega, it will be releasing a few patches over the next couple of weeks that add free downloadable content to the game. Each batch will contain content such as new outfits, weapons, items, and crafting components. The first downloadable content is available today, and three additional batches will be made available every week until February 14.
Read more at http://gematsu.com/2017/01/yakuza-0-launch-trailer-free-dlc-announced#1VuyI4SWCxIB7xJi.99
More at the link