Typhoon Noruda

The film takes place in a middle school on a remote island. Shuichi Azuma, a dedicated student, suddenly quits the baseball team, which leads to a fight with his best friend, Kenta. When a storm hits their school one day, Shuichi meets Noruda, a mysterious girl with a strange necklace, who seems to be somehow connected with the typhoon. Who is she? More importantly, why does Shuichi feel the need to help her?