Chapter 81 or 82.
It's not an 100% accurate quote but the MC basically says that 'it's a good thing that the island country (Japan) is going to die, to be exterminated. The day that island people are exterminated I will go to a restaurant and have a meal to celebrate. Those people are always trying to takeover our land. Because of historical reasons old people in our land hate them (definitely Japan even though the MC doesn't explicitly name Japan).