Tokyo, 2019. A massive tornado struck an entire section of the city. Amidst the chaos, figures appeared from the sky like flashes of light to stop the destruction. Their appearance was truly that of angels. Years pass, and in a world where the existence of angels has become an everyday sight, the protagonist, Tsubusaki, learns a shocking truth. In order to save his friend, Hajime, he throws himself into danger, triggering an unforeseen explosion. "Unleash my power." On the brink of death, what is it that Tsubusaki will obtain?