Yanlian (voiced by Maaya Sakamoto), a fourth-grade elementary school student, cooperated with good friends such as Aoi Mizusawa, Minami Wakaba (voiced by Juri Kimura), and Haruma Kamutsuchi (voiced by Chi Muranaka) to develop Monster Strike, and experienced a series of unprecedented magical experiences. On this day, Yanlian and his partners collected a dragon that could not exist in the real world in the basement of the research institute. In order to prevent the dragon from being killed by adults, Yanlian and his friends decided to send the dragon back to its original world. After that, they went to a magical different world together. And the destination they were going to was exactly where Yanlian's father, a famous archaeologist, disappeared. Following the back of his father, the teenagers returned to the starting point... This film is adapted from a well-known mobile game with more than 35 million users. The film was released simultaneously on 316 screens in Japan, and the audience satisfaction ranked first in the first week of debut.