What's guarding sweetheart about?

Yameng, a fifth-grade student at Holy Night College, is rumored to be a very powerful pupil. In fact, she is a lively girl who is not good at words and has a cold appearance. In order to hide herself, she often uses cold language to hide her cowardice. Finally, Yameng decided to face herself squarely and prayed for the guardian spirit to give her the courage to change herself. To her surprise, three guardian eggs appeared on the bed the next day, which helped Yameng change herself. On the other hand, there is a team called "Guardian" in the school. They have the task and ability to deal with all kinds of affairs in the school, and they also have many privileges. Many people regard them as idols. Although they are beautiful on the surface, in fact, they also have an unshirkable responsibility to fight against the enemy who must fight, revive the society, and find the legendary magic egg, the embryo that can realize any wish ... Later, the relationship between Yameng, Wei Shi and Doudou changed subtly.