"Crayon Shin-chan: Arashi o Yobu Appare! Sengoku Daikassen" is a feature-length anime film that blends comedy, adventure, and historical elements. The story centers on Shinnosuke "Shin" Nohara, a mischievous and energetic five-year-old boy, and his family, who are unexpectedly transported back in time to Japan's Sengoku period. This time travel occurs when Shin accidentally activates a mysterious artifact during a family outing. Upon arrival, the Nohara family finds themselves in the midst of a chaotic and war-torn era, where rival warlords vie for dominance.

The Nohara family is quickly caught up in the conflict when they encounter Oda Nobunaga, a powerful and ambitious daimyo. Nobunaga mistakes Shin's father, Hiroshi, for a legendary warrior due to a series of misunderstandings and coincidences. Hiroshi is reluctantly thrust into the role of a military leader, while Shin's mother, Misae, and younger sister, Himawari, adapt to their new surroundings in their own ways. Shin, true to his character, uses his wit and unpredictability to navigate the dangerous landscape, often causing both trouble and unexpected solutions.

As the story progresses, the Nohara family becomes entangled in a larger battle between Nobunaga's forces and a rival clan. Shin's antics and resourcefulness play a pivotal role in shaping the outcome of key events, often leading to humorous and chaotic situations. The film explores themes of family bonds, courage, and the clash between modern sensibilities and historical traditions. The Sengoku period setting provides a rich backdrop for the story, with its samurai culture, feudal politics, and dramatic battles.

The main characters retain their distinct personalities from the original series, with Shin's irreverent humor and mischievous nature driving much of the narrative. Hiroshi's bumbling yet well-meaning demeanor contrasts with Misae's practicality and strength, while Himawari adds moments of innocence and charm. The interactions between the Nohara family and historical figures like Nobunaga are a key source of both comedy and tension, as the family's modern perspectives clash with the rigid norms of the past.

The film balances its comedic tone with moments of action and drama, culminating in a climactic battle that tests the Nohara family's resilience and unity. Through their journey, the family not only influences the course of history but also learns valuable lessons about perseverance and the importance of sticking together in the face of adversity. The narrative concludes with the family returning to their own time, leaving a lasting impact on the Sengoku period and its key figures.