April 10th. Yesterday was the last day of the spring vacation, so from today's morning it was a school day. After his cute younger sister woke him up, Izukka believed that it would be the beginning of another normal day. As for the prediction of a random meeting with a girl, who called himself the Spirit ... Together with a sudden shock wave of the city landscape disappeared. On the corner of the street, which now turned into a crater, was a girl. "You also came to kill me?" She is a catastrophe that will destroy humanity, a monster of an unknown origin and a rejected creature. for peace. There are only two ways to stop this girl: destruction and conversation. Her younger Sister Kotori, wrapped in a military uniform, said Width: "If so, just go out with her and make the spirit fall in love with you!" "What ... that ... what! Enter the boy's new era, meet the girl!