Sega previously teamed up with Kai Razors for Yakuza 4. The result was the manliest razor promotional materials ever. It looked like this:

The Kai Razor promotion is continuing, although this time it doesn't involve razors, and its not for any particular game (it's certainly not for Black Panther, whose hero is a bit young to be shaving).

Visit the Kai Razor brand site, fill out some forms, and you'll enter yourself into the "Otoko wo Migaku Present Campaign." I think that translates to "Improve Your Manliness Present Campaign."

You can improve your manliness by winning one of these sweet Yakuza goods.

At top is a rock glass and ice pail set, presumably for drinking. It's imprinted with the Yakuza logo and a dragon tattoo.

At bottom is a nail cutter, presuming for cutting your nails. You'll also get a leather case for holding the nail cutter. This one doesn't actually have anything to do with Yakuza.

Thankfully, you can only win one of these -- not both. Don't ever do shots while cutting your nails.