The debut tweet for the Monster Hunter Rise Japanese commercial is very succinct: this man sings, dances, and hunts! That's all you need to know, as that's a fairly good description of this lounge singer turned Monster Hunter peddler. Around a minute and a half in it gets wackier, with the man showing up in the game with crude effects: it's the best part!
At this point Monster Hunter Rise: Sunbreak has been out for a few weeks, and it's been going pretty well for Capcom. Given how long the legs are with modern Monster Hunter games, it seems likely that Sunbreak will eventually arrive in the top 10 all-time seller list for the publisher.
I'm sure some exec somewhere is singing "Viva Sunbreak!" in their offices.