A member of the Time Patrol detects a disturbance in Japan in the year 1570. On her way to investigate, she is attacked and ends up trapped beneath the Nohara family's home at the end of the 20th century. With few resources left, she has no choice but to ask the Noharas for help. Together they travel back in time and meet Fubuki-maru, a lonely samurai who believes they are the legendary three people and a dog that someone from her family was destined to meet at a crucial moment. She asks them to help her defeat the sinister lord Unkokusai, a man with strange magical powers. The film is a comedic time-travel adventure in the Crayon Shin-chan franchise.