Eleven-year-old Takasumi Takane was promised a new bicycle if he placed in the top 100 on his exam, but he came in 112th. He lied to his mother, claiming he was 92nd, and tore up his answer sheets. On the way home from cram school, he accidentally broke the old bicycle he was supposed to pass down to his little sister, Tamaki, which made her angry. She then accused him of lying, and he started seeing her as a bother. One night, while searching for his missing dog, Chris, at a shrine, Takane encountered a young man named Yoyogi. Strangely, Yoyogi possessed the answer sheet marked "92nd." Yoyogi proposed a deal but threatened to return the answer sheet to its owner unless Takane gave him something he didn't need. Takane offered his sister, Tamaki. At that moment, Tamaki showed up, looking for Takane and Chris. Yoyogi turned Tamaki into a glowing object and swallowed her. Realizing he was wrong, Takane decided to save her. Yoyogi agreed to restore Tamaki to normal if Takane could beat him in a race using his broken bicycle. Can Takane win the race and rescue Tamaki?