Things Born of Water and Stone Must Turn Against Each Other

Nine years ago, in order to celebrate her great-grandfather's birthday, Akiyama Tu reluctantly went to fetch the ugly stone she buried next to the doghouse. It was said that this stone was passed down from generation to generation in her family. It was in this year that she also met a girl named Qiutong. This girl took her young grandfather and wandered around looking for a fake stove. But before Qiu Shantu could lend a helping hand to her, Qiu Tong hurried back to her hometown. After this farewell, they never saw each other again. Nine years later, after experiencing some accidents and changes, Qiu Shantu had to take Su Yao, who had just woken up, to explore the secret of the stone. Prompted by various coincidences, she finally understood everything. In ancient times, the aquatic stone in North African folklore has gone through many vicissitudes of time, traveled across the ocean, and arrived in this mysterious eastern country. What kind of waves has it caused so far?