Synopsis: High-rise Invasion arrive

Once a child with a love for the cosmos, Senya now lives an unremarkable life. All that changes in an instant when he gazes from his school's roof and spies a peculiar structure traversing the sky. Without warning, he is hurled into an alien realm of decay and dilapidation, where suspended bridges string together towering structures. Disoriented and overcome with awe, Senya perceives a figure atop a distant building and, nearby, a masked man bears a bloodied weapon...