Shizuka joins Nobita and the group to return the dinosaur twins Kyu and Myu to the Late Cretaceous period. She helps care for the dinosaurs alongside Nobita, demonstrating attentiveness to their well-being. She consistently shows compassion and support for Nobita, especially when Gian and Suneo initially doubt his claims about discovering a new dinosaur species, maintaining a trusting and empathetic attitude towards him.

Shizuka develops a close bond with Myu, the more energetic and capable twin. Merchandise, like UDF Figure No.541, visually reinforces this pairing. When a Nobisaurus flock member attacks Kyu for his inability to glide, Shizuka intervenes to restrain an enraged Myu attempting to defend her brother, preventing further conflict.

During the meteor crisis triggering the Cretaceous extinction, Shizuka actively participates in the rescue. She uses the Space Movement Crayon to draw teleportation circles, helping relocate dinosaurs to the safety of the expanded Breeding Diorama island. This collaborative effort proceeds despite attacking pterosaurs and initial opposition from the Time Patrol.

Her role remains supportive and team-oriented throughout the mission's challenges. She contributes to the group's efforts without seeking individual recognition, focusing solely on the collective goal of ensuring the dinosaurs' survival.