Ep. 1: Riki Naoe meets Saya Tokido who recruits him to find a secret treasure in school

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Riki Naoe encounters Saya Tokido at night, who urges him to flee after a gunshot. He retrieves her abandoned student handbook and returns it the next day. Saya invites Riki to the school roof, warning that the Darkness Executives might discover her identity. She pushes him off the ledge, but Masato Inohara catches him below. Riki asks Kyousuke Natsume about the group and receives a warning. After Kengo Miyazawa saves Riki from a noose, he escapes an attack involving saltwater balloons and power lines. Impressed by his survival, Saya enlists Riki to help locate a secret treasure within the school. They discover a mysterious device in a classroom, activate it to reveal a hidden entrance, and escape into it while being pursued by the Darkness Executives.