Ryouko Miyazaki, a student and broadcasting club member, becomes the enigmatic core of a mystery when her sudden disappearance sparks an investigation by classmates Kenichi Akizuki and Misako Watanabe. Their search uncovers a cryptic clue signed by Koushin Okazaki, a deceased student who died by suicide the prior year. Okazaki’s final message—a desire to “become Peter Pan”—threads themes of preserved youth and escapism into Ryouko’s vanishing. While her exact connection to Okazaki remains uncertain, rumors persist linking her absence to his death, suggesting unresolved echoes between past tragedies and present tensions within the school’s fraught atmosphere.