Nodoka calls Chiyu over to her house when it appears that Latte has become ill. As there doesn't appear to be a Megabyogen attack, Chiyu believes that they should take her to the local animal clinic that Hinata's family runs.
Nodoka and Chiyu keep reminding Hinata to keep their identities as Pretty Cure a secret, as she nearly lets it slip as her friends discuss the monster attacks.
Nodoka discovers that the editor of the school newspaper, Michio Masuko, is spying on her since he believes that she may be linked to the monster attacks happening in Sukoyaka.
The girls take a train ride to a museum, where Nodoka meets a sculptor who makes art from glass. However, they are shocked to discover that the Healing Animals and Latte have decided to come and join them, despite being asked to stay home.
The Cures race to the second Megabyogen, which Shindoine created to pollute a river, managing to purify it as Cure Fontaine receives power from the Water Spirit.
After their previous encounter with multiple Megabyogens, the Healing Animals decide to put the Pretty Cure through a boot camp to improve their teamwork.
Hinata begins to consider quitting being a Pretty Cure, much to her friends' dismay. While trying to explain her feelings, Latte senses a Megabyogen, so the girls go looking for it.
Nodoka attends a doctor's appointment, and is happy to find out she has fully recovered from her previous illness. She is also excited to discover that Sukoyaka City is holding a festival.
After learning about the legend of the Eternal Tree, Nodoka, Chiyu and Hinata go to make a vow of friendship under it. However, they are shocked to discover that the tree was killed during a recent storm.
