This evil thing is actually a WW2 Deku harem AU. If you can see who the prototype is, you are in trouble. If I don't explain it, you can just read it as a derivative novel of the Orange Light game "Dragon Hatchling";
The technological level of the fictional world in the article is similar to that of the Ming and Qing Dynasties, but the system refers to the Tang Dynasty. Some settings, such as the settings of the Central Plains Dynasty and neighboring countries, borrowed from the background of Long Chu. The timeline can be understood as the generation of 45's grandson;
The level setting of the harem in this work: below the queen, there are two noble concubines (first grade), four concubines: Xian, Liang, Shu, De (second grade); nine concubines: Zhaoyi, Zhaorong, Zhaoyuan, Xiuyi, Xiurong, Xiuyuan, Chongyi, Chongrong , Chongyuan (the third rank); Jieyu (the fourth rank, from Jieyu onwards can be the lord of the first palace); Ronghua (the fifth rank); Beauty (the fifth rank); Baolin (the sixth rank); Cainv (the seventh rank); Changyi (the eighth rank).
Purpose: A low-level character changes his destiny against the will of heaven