Neo-Venezia has reached a long winter. Ai, Azusa and Anya, who were practicing jointly in the cold weather, visit the Undine Museum, led by Akira who seems not her usual self. At the museum, the trio meet its director, Asuka who is Akira's senior known as Himeya's legendary undine. The two of them are the successors to a gondola that has been carefully passed down since the founding of Himeya Company. However, Akira reveals that Aika, who is expected to inherit the gondola, has no intention of doing so. Azusa, who is not convinced, tries to find out why.
| Directing | Junichi Sato | Director |
| Writing | Junichi Sato | Screenplay |
| Directing | Takahiro Natori | Director |
| Visual Effects | Yoko Ito | Character Designer |
| Visual Effects | Yoko Ito | Supervising Animation Director |
| Art | Sachiko Kigasawa | Art Direction |
| Camera | Hidenori Manaka | Director of Photography |
| Sound | Choro Club | Original Music Composer |
| Sound | Takeshi Senoo | Original Music Composer |
| Visual Effects | Hiroyasu Oda | Animation Director |
| Art | Yoko Ito | Prop Designer |
| Sound | Masao Fukuda | Music Producer |
| Sound | Yui Makino | Theme Song Performance |
| Visual Effects | Miho Kimura | Color Designer |
| Visual Effects | Noriko Onishi | Animation Director |
| Visual Effects | Saori Hosoda | Animation Director |
| Visual Effects | Masaki Tanigawa | Animation Director |
| Visual Effects | Daisuke Saito | Animation Director |
| Visual Effects | Megumi Nagayama | Animation Director |
| Visual Effects | Kanae Hatakeyama | Key Animation |
| Visual Effects | Saori Hosoda | Key Animation |
| Visual Effects | Masaki Tanigawa | Key Animation |
| Visual Effects | Hitoshi Miyajima | Key Animation |
| Visual Effects | Yusuke Adachi | Key Animation |
| Visual Effects | Kanae Komatsu | Key Animation |
| Visual Effects | Noriko Onishi | Key Animation |
| Visual Effects | Akio Kitahara | Key Animation |
| Visual Effects | Hiroshi Tsukada | Key Animation |
| Visual Effects | Eiji Tamari | Key Animation |
| Visual Effects | Mayumi Nakamura | Key Animation |
| Visual Effects | Eiichi Tominaga | Key Animation |
| Visual Effects | werkbau | Key Animation |
| Visual Effects | Daisuke Saito | Key Animation |
| Visual Effects | Hiroshi Yamamoto | Key Animation |
| Visual Effects | Yukari Manabe | Key Animation |
| Visual Effects | Keiichiro Honjo | Key Animation |
| Visual Effects | Hiroyasu Oda | Key Animation |
| Visual Effects | Hiroshi Yamashita | Key Animation |
| Visual Effects | Momoko Nagakawa | Key Animation |
| Visual Effects | Pang Puikei | Key Animation |
| Visual Effects | Ayako Tanai | Key Animation |
| Visual Effects | Hong Penny | Key Animation |
| Visual Effects | Megumi Nagayama | Key Animation |
| Visual Effects | Takaaki Wada | Key Animation |
| Visual Effects | Yoko Ito | Key Animation |
| Visual Effects | Toshiyuki Iwamoto | Key Animation |
| Visual Effects | Tenya Sato | Key Animation |
| Visual Effects | Chang Shao-wei | Key Animation |
| Visual Effects | Yuki Nakano | Key Animation |
| Visual Effects | Hideki Inoue | Key Animation |
| Visual Effects | Hideki Saijo | Key Animation |
| Production | Toshio Iizuka | Producer |
| Production | Tatsuro Hagiwara | Production Consultant |
| Art | Mieko Nakajima | Background Designer |
| Art | Maho Ochiai | Background Designer |
| Art | Kohaku Ujiie | Background Designer |
| Art | Chiaki Tsujimoto | Background Designer |
| Art | Yoshimasa Sato | Background Designer |
| Art | Toshihiko Goto | Background Designer |
| Art | Makoto Sakaba | Background Designer |
| Visual Effects | Yutaka Kurosawa | Compositing Artist |
| Visual Effects | Akihiro Takahashi | Compositing Artist |
| Editing | Misato Takikawa | Editor |
| Sound | Junichi Sato | Sound Director |
| Sound | Yasuno Sato | Music Director |
| Sound | Toshiya Wada | Sound Effects |
| Sound | Choro Club | Musician |
| Sound | Takeshi Senoo | Musician |
| Sound | Takehiko Kamada | Sound Engineer |
| Crew | Takehiko Kamada | Mixing Engineer |
| Sound | Masakazu Sato | Music Producer |
| Production | Toshihiro Takahashi | Executive Producer |
| Visual Effects | Haruka Muto | Compositing Artist |
| Visual Effects | Yoshihiro Togo | Compositing Artist |
| Visual Effects | Yusuke Noguchi | Compositing Artist |
| Visual Effects | Tomotaka Mogi | Compositing Artist |
| Art | Takahiro Natori | Storyboard Artist |
| Sound | Soushi Shiihara | Sound Mixer |
| Writing | Kozue Amano | Original Story |
| Crew | Miho Kimura | Special Effects |
| Directing | Takahiro Natori | Second Unit Director |
| Editing | Yohei Yamamoto | Online Editor |
| Editing | Takaaki Matsutake | Online Editor |
| Production | Hikaru Nagamori | Production Assistant |
| Production | Yuji Takenaka | Additional Production Assistant |
