Tokyo's skyline is no longer adorned with the usual symbols of hope and freedom. Instead, it is overshadowed by a menacing alien spacecraft that arrived three years prior, unleashing a devastating war threatening human existence. Amidst this chaos, the Japanese government mobilizes resources to combat these otherworldly foes, leading to a surge in weapon production and societal unrest. Despite these turbulent times, Kadode Koyama and Ouran Nakagawa navigate their daily lives as high school students, maintaining a facade of normalcy. However, as they confront the harsh realities of adulthood, they begin to realize that the true peril facing humanity lies not in the Invaders above, but in the very nature of humanity itself—a realization that challenges their perceptions of trust and deceit in a world marred by uncertainty.