Ep. 13: Akari assumes leadership of Aria Company following Alicia's retirement and marriage announcement.

Aika, Alice, and Akatsuki confirm that Alicia is retiring to marry and join the Gondola Association. Alicia delayed this decision until Akari achieved Prima status, causing Akari to blame her own lack of reliability. As Alicia transfers control of Aria Company to Akari, the latter struggles with the transition. Alicia reveals she postponed her own exam to avoid leaving Akari, acknowledging the younger undine's long-standing capabilities. Retired Mr. Mailman hires Akari for a tour, offering customer referrals. During the retirement ceremony, all city undines participate. The next morning, Akari reflects on memories within the company before opening the shutter for a new beginning. An afterword details future outcomes, including Athena becoming an opera singer and Akira remaining the top Prima, concluding with Ai's first day as a new Pair.

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