The port town of Sukuba was damaged by the huge waves caused by a monster that suddenly appeared from the sea. The monster, which ceased to be active, dissolved into the sea and became a rich source of nutrients for seafood, enriching the economy of Sukuba Town, and came to be called Gaea-Tima, the god of fertility. A girl named Miyako Morino, who was a victim of the disaster, made Gaea-Thima dolls to commemorate the event, which were sold as souvenirs and became popular. However, a monster appears in the restored Sukubai Town for the first time in 10 years... Are monsters enemies or allies of humanity?