City girl Ronalda "Ronnie" Anne Santiago intends to celebrate her "Summer of 12" at Xtreme Eddie's with her best friend, Sidney "Sid" Chang, but her family surprises her with a trip to Japunda, Mexico, much to her dismay. However, during the trip, Ronnie Anne takes interest to a necklace that a shopkeeper claims to hold the last connection between humans and gods, but her mother, Maria, dismisses it as a hoax. Despite this, Ronnie Anne buys the necklace behind her mother's back.

The family head to their Mama Lupe's house, where Ronnie Anne points out a nearby mountain that resembles a half-pipe. Her uncle, Carlos, tells her that the mountain is named after the petrified form of the demigoddess Punguari whose parents denied her from becoming a full-fledged god due to her rebellious nature and lack of responsibility. Dissatisfied, Punguari snuck out and stole a mask that allowed her to become a god. However, the ground around her started to crack and separate, and Sisiki, her mother, was forced to petrify her daughter. Should Punguari be freed now, Mexico would be in danger.

The next day, Ronnie Anne decides to go to Mount Punguari, where she starts to synchronize skate with Sid over video call. However, Ronnie Anne falls off her skateboard, breaking her necklace and releasing Punguari. Soon, a young girl who introduces herself as Shara calls for help, her leg having been trapped underneath a branch following an earthquake. Accompanied by Shara, Ronnie Anne is confronted by her mother, who is angry that she snuck out to do her own thing. Later that evening, Maria expresses her frustration about Ronnie Anne's rebellious nature, prompting Mama Lupe to take her outside to practice her chancla throwing.