I don't know when the giants that suddenly appeared became the gravediggers of human civilization. They preyed on humans who had no ability to resist, forcing them to build high walls to protect themselves. Until one day, the super-large giant broke through the solid barriers and brought a bloody and cruel feast to the humans who were accustomed to a comfortable life. Hanji (played by Satomi Ishihara) secretly captured a giant. She was crazy and obsessed with studying the habits of the giants, trying to find the weaknesses of the enemy, and got the inspiration for the three-dimensional maneuvering device from an accident. Sasha (played by Nanami Sakuraba), who came from a poor family, had excellent archery skills and a super good appetite. She was fortunate to become a member of the investigation team. Food was her biggest motivation. Lilu (played by Rina Takeda) and Fuji (played by Hide Watanabe) worked hard to hone their fighting skills. They hoped to live a happy life, but the years of peace were far away. The little people struggled to survive under the shadow of the giants...