On That Special Day ...During the annual flooding of Neo-Venezia, when the city comes to a standstill, Akari is caught out in a rainshower and shelters in Aika's room at Himeya Company. While there, Akari sees the other employees are deferential to Aika, the heir to the company. When Aika's strict mentor, Akira, chastises Aika for slacking off despite the flood, they fight and Aika leaves to stay the night with Akari at Aria Company. Aika describes in a flashback her first meeting with Alicia, and how Alicia inspired her to become an undine (gondolier). The next morning, Akira arrives to demand that Aika return home, and the trainees learn that their mentors have been friends and rivals since childhood...