The Ultra-Topping Cheese Pizza features four times the mozzarella of the chain's regular pizzas which basically makes it look more like a plate of cheese than pizza.
It's joined by the Ultra-Topping Pepperoni Pizza and the Ultra-Topping Mayo Jaga Pizza. Like the cheese version, each of the pizzas includes four times the normal amount of its namesake topping. If you're wondering what Mayo Jaga is, it's a topping combination of mayo, corn, cheese, potato, pork sausage, and parsley flakes.
For comparison, here's a photo of the Domino's regular Mayo Jaga Pizza:

And, here's one of the Ultra-Topping Mayo Jaga Pizza:

Photos via Domino's Japan.