One of my favorite restaurants in Las Vegas, hands down, and I'm not alone. Every time I go to this place there is a line out the door because of all the people waiting to experience this culinary delight.
The noodles and toppings are all delicious, but there's something about the broth that makes this ramen to die for. Also, the pork. It's flavorful and fatty, and I would recommend getting extra if you feel like spoiling yourself.
Be careful though, this stuff is about as addicting as crack. After your first time, you'll keep going back until you realize it's gotten out of hand, and that you need to stop for the sake of your bank account and health. I put on about five pounds after first discovering this place, and I've gotten many friends addicted as well.
My personal favorites include the Spicy Tonkatsu with egg and shredded onion, and Kuro with butter and extra pork.