Ep. 1: Koyanagi and Kabakura recount their high school volleyball rivalry and eventual romance to friends.

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Narumi and Hirotaka encounter Koyanagi at a coffee shop, where she reveals she is attending a 2.5D volleyball show with Kabakura. The group recalls their high school days when both served as volleyball captains in their second and third years. Koyanagi explains that they initially acted as rivals, fighting for gym access until she blackmailed Kabakura with a photo of his otaku interests. This leverage allowed her team more practice time. Later, Kabakura impressed Koyanagi with his jump shots, agreeing to teach her only if she deleted the incriminating picture. After a heartbreaking loss in their final game, the two reconnected post-graduation through a letter. They exchanged familiar banter before finally embracing, unwilling to lose their bond. Back in the present, Kabakura scolds Koyanagi for the disclosure while they argue over who initiated the hug. Narumi and Hirotaka notice Koyanagi still possesses the photo, realizing its sentimental value.