Dead Dead Demon's Dededede Destruction

Looking up at the sky, do you see freedom, hope and a blue sky? Unfortunately, the people living in Tokyo don’t. Instead, a menacing alien mothership dominates the city’s skyline.
The Invaders arrived three years ago, starting the biggest war humanity had ever faced, a conflict that could potentially end the world. The Japanese government was quick to respond, creating weapons on a mass scale that sparked controversy and anti-war movements.
The day the Invaders arrived was a turning point, but it did not change much in the aftermath. Kadode Koyama and Ouran Nakagawa continue to live their lives as carefree high school students, going to school, playing with friends, and enjoying themselves.
As they grow older, they come to understand the true meaning of being an adult in a world where adults are seen as demons who only deceive and ruin. They begin to realize that the greatest threat to humanity is not the Invaders but humanity itself.