At Yuri's wedding, Aya encounters Ecchan, another guest who also shared past romantic feelings for the bride. Their mutual history with Yuri creates an immediate connection. After the ceremony, Aya hears Ecchan crying and approaches her. She proactively invites Ecchan for drinks, extending the invitation to her apartment later. During their time there, Ecchan feels nauseous and lies down. Aya undresses her, leading to physical closeness. Aya then kisses Ecchan on the lips, and they sleep beside each other. This encounter, occurring within the condensed timeframe of the wedding and its immediate aftermath, marks the beginning of Aya and Ecchan's romantic relationship as girlfriends.