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Puff and Aroma explain to Haruka, they got separated from Kanata after the Hope Kingdom was attacked by Dys Dark, led by a witch named Dyspear, entrusted with finding the three Princess PreCures who possess the Dress Up Keys. As Haruka decides to train hard to become a proper princess, student council president Minami Kaidou finds a Dress Up Key washed up on the beach. After observing Minami's graceful elegance, Haruka asks her to teach her how to do ballet so that she can become more princess-like. Despite the strictness of the lessons, Haruka continues to work hard, only to end up spraining her ankle whilst attempting an advanced move. While treating her injury, Minami confesses that she is far from perfect, only possessing her ballet skills from training hard as a kid, expressing her joy that someone asked her for lessons. Later, as Close targets a boy yearning to be a soccer star to create a Trophy Zetsuborg, Minami spots Haruka transforming into Cure Flora as she goes to fight against it. With Haruka's sprained ankle leaving her at a disadvantage, Minami's desire to protect her gives her the ability to transform into Cure Mermaid and defeat the Zetsuborg. Just as Haruka and Minami are about to celebrate their new partnership, Puff and Aroma discover that the third Princess Perfume in their possession has gone missing.
Yu Shimamura
Haruka Haruno / Cure Flora (voice)
Masumi Asano
Minami Kaido / Cure Mermaid (voice)
Hibiku Yamamura
Kirara Amanogawa / Cure Twinkle (voice)
Miyuki Sawashiro
Miyuki Sawashiro as Towa Akagi / Twilight / Cure Scarlet (voice)
Nao Toyama
Pafu (voice)
Shiho Kokido
Aroma (voice)
Haruka Yoshimura
Yui Nanase (voice)
Mayumi Shintani
Miss Shamour (voice)
Shinnosuke Tachibana
Prince Hope Grand Kanata (voice)
Yoshiko Sakakibara
Dyspear (voice)
Mitsuaki Madono
Close (voice)
Satoshi Hino
Shut (voice)
Yuki Kaida
Kuroro / Lock (voice)
Shiori Izawa
Stop (voice)
Miyako Ito
Freeze (voice)
Takayuki Nakatsukasa
Zetsuborg (voice)
Arisa Kiyoto
Hitomi Segawa (voice)
Atsushi Abe
Yuki Aihara (voice)
Atsushi Tamaru
Shuu Imagawa (voice)
Ayano Niina
Ayaka Nishimine (voice)
Ayu Matsuura
Momoka Haruno (voice)
Yasunori Matsumoto
Ibuki Haruno (voice)
Yuko Gibu
Moe Haruno (voice)
Haruka Chisuga
Hanae Komori (voice)
Haruno Inoue
Yōko Kanda (voice)
Kana Ueda
Riko Furuya (voice)
Kazuyuki Okitsu
Wataru Kaidō (voice)
Masahito Yabe
Kimimaro Ijuin (voice)
Mayuki Makiguchi
Karin Akeboshi (voice)
Mayumi Saco
Kyōko Tachi (voice)
Risa Mizuno
Reiko Kisaragi (voice)
Saki Fujita
Chieri / Previous Generation Cure Flora (voice)
Satsuki Yukino
Yura / Previous Generation Cure Mermaid (voice)
Kaori Shimizu
Sei / Previous Generation Cure Twinkle (voice)
Sayaka Ohara
Stella Amanogawa (voice)
Sayuri Yahagi
Ranko Ichijou (voice)
Taishi Murata
Naoto Koshiba (voice)
Takumi Yamazaki
Bororo Boan'nu (voice)
Toshiko Sawada
Yume Mochizuki (voice)
Yusuke Kobayashi
Kenta Hirano (voice)