During the period, as a "Pizza Hut Birthday Festival Set", you can purchase a set of "Anniversary 4" and "Natural 4" at a 39 (thank you)% discount from the regular price. The discounted price is 2,732 yen for the M size and 4,074 yen for the L size.
"Anniversary 4" is a Japanese-only product commemorating the 55th anniversary, where you can enjoy 4 types of "rich formage," "wild garlic," "pizza hut classic," and "genovese" in one piece. On the other hand, "Natural 4" allows you to enjoy four types of toppings: "sausage & mushrooms", "bacon & asparagus", "tomato & basil", and "peparoni & corn". In both cases, the dough is limited to "fluffy bread pizza".