She is known to be a gentle and kind lady that cares about the others' dreams.
She first appears in episode 18. She is holding an autograph event to celebrate the 50th anniversary of her book, the Princess of Flowers. This is her first public appearance after writing the book. Haruka finally meets her and asks what happens with the flower princess. She says she can't answer that because she doesn't intend to write an ending. After being asked again, she explains her reasons for not writing another book. Later, together with Yui and the visitors, she is trapped inside a despair panel by Twilight and her despair is used to defeat the Princess Pretty Cure. After being freed, she meets Cure Flora after waking up. Flora greets her and goes away. She is revealed to be the headmistress of Noble Academy in the end of the episode, though the girls are still unaware of this.
In episode 23, she finds a discouraged Towa struggling with her own problems. After trying to cheer her up, her dream is once again locked in a cage of despair and used to summon a Zetsuborg. Lock increases the power of the Zetsuborg and collects her energy of despair for Dyspear's healing. The Zetsuborg is defeated and Scarlet releases her from the cage of despair. In the end of the episode, Mochizuki finally introduces herself as the headmistress for the girls and accepts Towa as an official student of Noble Academy.
In episode 49, she and Shirogane-san join the surviving Noble Academy students to encourage the defeated Cures, indirectly helping them re-transform and regain their courage so they can defeat Dyspear.
In episode 50, she is last seen with Shirogane-san in the rose garden greeting Shut in a friendly way, welcoming him to the human world.
- Shirogane-san: She is a close friend and seems to be the only one that knows her secret.
- Akagi Towa : In episode 23, they met each other for the first time, even though Towa remembered her as one of the people she captured as Twilight. Yume encouraged Towa when she was confused and was the one who accepted Towa as an official student of Noble Academy.
- Like Mrs. Otaka From Yes! Pretty Cure 5, who was the headmistress of L'École des Cinq Lumières, Yume was secretly the Headmistress of Noble Academy.
- It is revealed that she gave Towa the surname Akagi.
|V • T • EGo! Princess Pretty Cure characters|
|Cures||Haruno Haruka/Cure Flora • Kaido Minami/Cure Mermaid • Amanogawa Kirara/Cure Twinkle • Akagi Towa/Cure Scarlet • Past Princess Pretty Cure|
|Mascots||Pafu • Aroma • Miss Shamour • Kuroro|
|Villains||Dyspear • Twilight • Close • Shut • Lock • Stop & Freeze • Zetsuborg|
|Others||Prince Kanata • Nanase Yui • Haruno Moe • Haruno Ibuki • Kisaragi Reiko • Azuma Seira • Nishimine Ayaka • Shirogane-san • Amanogawa Stella • Takamagahara Ken • Bauanne Baurollo • Aihara Yuuki • Imagawa Shuu • Koshiba Naoto • Ichijo Ranko • Tachi Kyoko • Haruno Momoka • Tina • Mochizuki Yume • Kaido Wataru • Komori Hanae • Kano Sayaka • Kurita Mai • Komaki Noriko • Hirano Kenta • Furuya Riko • Kitakaze Asuka • Kaido Tsukasa • Kaido Masumi • Ijuin Kimimaro • Nishikido-san • Akehoshi Karin|
|Movie only||Pumplulu Princess • Warp • Refi • Night Pumpkin • King Pumpkin • Queen Pumpkin|