It's.. fine.

Kaito gets a mini campaign to himself along with a more proper backstory. It's nothing too special, but I weirdly found it a bit more enjoyable than Lost Judgment's main story. Maybe it's just cause Kaito himself is just a really enjoyable character. That being said, the story is annoyingly predictable (though maybe I'm just too familiar with RGG's writing style at this point).

As for the actual combat, I'm not a fan of how Kaito plays. He gets tweaked versions of Kiryu's Yakuza 0 Brawler and Beast styles that just feel.. a bit strange to me. Not sure what it is, but they just feel inexplicably off to me in the way they were ported to the Dragon Engine. I wouldn't go so far as to say they're flat out bad, but I did often find myself wishing I was just playing Yakuza 0 instead.

I don't think that the $30 they ask for is worth it at all for what you actually end up getting, but I think it's a fine enough DLC if you can get it at a discount.