"Ninja Hattori-kun NinxNin Furusato Daisakusen no Maki" is a feature-length anime film based on the popular "Ninja Hattori-kun" series created by Fujiko Fujio. The story revolves around Kanzo Hattori, a young ninja from the Iga clan, who lives with the Mitsuba family in modern-day Japan. Hattori is accompanied by his brother Shinzo, his ninja dog Shishimaru, and his rival Kemumaki, a Koga ninja. The narrative begins when Hattori and his friends receive a mysterious letter from Hattori's hometown, Iga Village, urging them to return immediately.

Upon arriving in Iga Village, Hattori and his companions discover that the village is under threat from a powerful and malevolent force. The village's sacred treasure, the "Iga Scroll," has been stolen, and its absence has caused a series of calamities, including natural disasters and the disappearance of villagers. The scroll is said to contain ancient ninja secrets that, if misused, could bring about great destruction. Hattori, Shinzo, Shishimaru, and Kemumaki must work together to recover the scroll and restore peace to the village.

The group embarks on a perilous journey, encountering various challenges and adversaries along the way. They face off against a rogue ninja faction led by a cunning and ruthless leader who seeks to exploit the scroll's power for personal gain. The story delves into themes of loyalty, teamwork, and the importance of protecting one's heritage. Hattori's ninja skills and quick thinking are put to the test as he navigates through traps, battles, and puzzles to uncover the truth behind the scroll's theft.

Throughout the film, the dynamics between the characters are highlighted, particularly the rivalry and eventual camaraderie between Hattori and Kemumaki. Shinzo's youthful enthusiasm and Shishimaru's loyalty provide both comedic relief and emotional depth to the narrative. The film also explores the cultural significance of the Iga Village and its traditions, emphasizing the value of preserving history and community.

The climax of the story involves a dramatic confrontation with the antagonist, where Hattori and his friends must use all their skills and ingenuity to outwit their foe and reclaim the Iga Scroll. The resolution sees the village restored to its former glory, with the characters reflecting on the importance of their journey and the bonds they have strengthened. The film concludes on a hopeful note, reinforcing the themes of unity and resilience.