My classmate is a mermaid-我的同学是美人鱼

It tells the story of seven mermaid princesses with different personalities who set foot on the human land school for the first time. In the process of overcoming the unfamiliar new environment and fighting against the obsidian, the princesses gradually recognize themselves, learn to unite, and take on the responsibility. In the end, they collect the broken bubble gems and take on the responsibility of protecting the ocean and humans. Each princess has a unique personality. In battle and life, they gradually learn to unite and fight together.