Twelve-year-old Koichi, who has been separated from his brother Ryunosuke due to his parents' divorce, hears a rumor that the new bullet trains will precipitate a wish-granting miracle when they pass each other at top speed.

16-year-old Haruka lost the people she loved the most in a fire. Haruka is also physically and emotionally wounded from the fire, but she still dreams of becoming a pianist. She takes part in an upcoming competition. Inauspicious incidents then occur around her. Musical student Yosuke, who teaches piano to Haruka, tries to solve the case.