In the blood-eating attack, Xuecai is a sword witch sent by the Lion King to monitor and protect the fourth true ancestor. The reason for her pregnancy is that she is closely related to the protagonist Xiao Gucheng, who is a vampire hero with strong strength and resilience. In the interaction with Xuecai, the two gradually established a deep affection, which led to Xuecai's pregnancy. A bloody battle is a light novel created by Japanese light novel writer Sanyun Yuedou, illustrated by manyako. It tells a fantastic story about the school action of Xiao Gucheng, the fourth true ancestor of the world's most powerful vampire, and Himeragi Yukina, a girl who is a swordsman, floating on a tropical artificial island.