I found an interesting supermarket on the way to my mother's house. Inside, they have a Mega-sized fried rice and Mega-sized yakisoba for 322 yen each. Despite various price increases, the amount and taste of the ingredients are great. The dishes come in a 25 cm diameter, 2.5 cm tall container filled generously. They also offer Mega-sized Neapolitan and slightly more expensive fried rice. They even have yakisoba on the menu.