On her first day at a new school, Hana Nono hears a mysterious baby cry, which turns out to be the adorable Hugtan, who grants her the power to become Cure Yell.
While thinking about scouting Homare as the third PreCure, Hana comes across her taking care of a stray dog, which she rescued while experiencing a time stop herself.
Saaya feels anxious over taking part in an audition against another actress who was in the same commercial, especially when it is revealed her mother, Reira, is a famous actress.
Henri Wakamiya, a top skater and Homare's childhood friend, comes to ask Homare to return with him to Moscow, feeling that staying in Japan is preventing her from returning to form.
While taking part in a hiking trip, the girls come across Emiru Aisaki, the classmate of Hana's sister Kotori, who is very cautious about the dangers of hiking to the point of bewildering her classmates.
Using the Mirai Pad to help out at a food fair, Saaya and Homare become waitresses while Hana alone gets stuck in a different outfit helping out at a takoyaki stand.
With Hug-tan ending up with a fever as a result of exhausting her asu power, Hana blames herself, feeling she doesn't deserve to be a Precure as she doesn't have anything special she can do.
Ruru joins the others as they spend the day looking after babies at a daycare. As Ruru quickly scans a textbook to learn how to look after the babies, Saaya starts becoming competitive with her over their affections.
While excited about being a PreCure, Emiru feels downhearted over not a failed attempt at patrolling the town while Ruru becomes worried about her after Emiru lashes out at each other.
Cure Black and Cure White, whose real names are Nagisa Misumi and Honoka Yukishiro respectively, assure Emiru and Ruru that it's okay to butt heads with each other sometimes.
Shocked to find the town's local night pool event is lacking sense compared to what she pictured, Hana and the others help out to make the pool more stylish by the time it opens.
As the gang spend time at a summer festival, Homare, who has been developing feelings for Harry, learns a bit about his past while also sharing some of her own.
Homare's pet dog, Mogumogu, falls in love with a cat named Lily who appears in a commercial. Wanting Mogumogu to meet Lily, the gang train him to take part in an audition to star in a commercial with her.
Hana takes everyone to meet her grandmother, Tanpopo, who runs a traditional sweets shop. However, Tanpopo, agitated by complaints about her sweets declining in quality, ends up injuring her back.
The gang decide to end their summer vacation with a tour around the world, visiting several foreign countries before finishing with a stay a Japanese hot spring inn.
Trapped inside Bishin's newest Mou-Oshimaida, Homare finds herself inside the story of The Little Mermaid formed from their hearts, where she is a mermaid who encounters a prince resembling Harry, who appears to have forgotten about her.
Emiru feels downhearted when a TV personality criticizes Twin Love's music as half-hearted. Meanwhile, Henri, who is practising for a performance, is approached by Cryase employee Listle, who wishes to scout him for Cryase Corp.
Curious about whether the monsters that the PreCure fight are because of Hana's clumsiness, Kotori ends up tagging alongside a couple of Hana's classmates, who are members of a Cure Yell Fan Club, as they look around town for Cure Yell.
To help further her acting, Saaya requests to work at a maternity ward with everyone. While there, Saaya meets a girl named Aya, whose mother is scheduled to give birth via a Caesarean section operation.
The Pretty Cures from both Witchy PreCure. and Kirakira PreCure a la Mode are attacked by Dr. Traum, whose new time-manipulating mech reverts them back to their younger selves.
Following Traum's explanation of Criasu's goals, Harry reveals that Hugtan is actually Precure from the future named Cure Tomorrow, who had expended Mother's power escaping into the past with him.
Emiru starts behaving oddly as she tries to suppress her feelings over Ruru. Things get worse when Emiru suddenly loses her voice, leading to both her and Ruru losing their Mirai Crystals.
Conflicted by her feelings for Harry and his inevitable departure, Homare tries to distance herself from Harry to concentrate on the tournament. Meanwhile, Hana is again confronted by Cry, once again leaving her bewildered.
Just as Saaya prepares to shoot a movie with Reira, Listle, whose heart has been taken by Cry, uses a device to trap everyone inside the world of the movie.
On New Year's Day, Hana encounters Cry again, who claims that time stopping in the future was the result of people becoming consumed by the darkness in their hearts.
Despite overwhelming odds, Hana remains firm in her support of having hope for the future, allowing her to rescue Hug-tan, revive the other Cures, and resume everyone's stopped time.
As the girls spend their last together, a time machine Traum is working on suddenly becomes a Mou-Oshimaida, which the Cures defeat with the help of another Pretty Cure named Cure Star.
