Titles involving "missing" characters often serve as modern-day fables about vigilance and the fragility of safety. Within the entertainment sphere, they provide a safe space to explore dark themes, such as abduction or loss, while ultimately offering the catharsis of a resolution (the "rescue").

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Riko-chan, whose full name is Rikochette Akane, was a familiar face in Willowdale. She was the youngest in her family, having two older siblings, and was known for her adventurous spirit and contagious laughter. On the day she went missing, Riko-chan had been playing in the local park with her friends. As the afternoon wore on, while her friends decided to leave and grab a snack from a nearby ice cream truck, Riko-chan lagged behind, fascinated by a peculiar object lying on the grass.