Venomous monsters invaded the surface. After more than 10 years of struggle, humans evolved and hid underground in desperation. Under the leadership of Yun Yun, the great leader of mankind, people expanded their territories underground and reproduced their descendants. But Moel's prophecy made it difficult for the heroine to rest assured. The heroine disguised herself as a man and entered the campus for Heggis just to find that "weakness."
Purpose: Communication is the bridge between people?