Ep. 1: Nayu Hayama exposes adult panties at Ounan Middle School entrance ceremony

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Twelve-year-old Nayu Hayama enters Ounan Middle School, a private girls' institution, as the top student. During the entrance ceremony speech, she trips and reveals lace adult panties. Classmate Yako Jinguji witnesses this incident and suspects Nayu of paid dating. Yako and her friend Haruka Shiraishi investigate the truth. When the three meet in the hallway, Nayu gropes Haruka's large breasts. Driven by growing suspicion, Yako decides to capture photographic evidence to confirm her theories about Nayu's behavior.