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Ame ni Kieta Himawari

On a rainy day, 11-year-old girl Aoi Ishioka, suddenly disappeared around a rice field road where sunflowers bloom, leaving only one umbrella. Inspector Kenichi Nara rushes to the scene after receiving the report. He meets Masanori Ishioka, Aoi's father, who has been living separately from his family, while he and his wife are in the middle of divorce proceedings. Masanori wants to participate in the search and while searching for Aoi, Kenichi remembers his younger sister, Mayuko, who has been shutting herself off from everyone after being attacked when she was a student. This incident caused Kenichi to become a detective as he regretted not being able to protect his sister. Due to this, Kenichi wants to do his best to bring Aoi back to her family.