In Eternal Night City, darkness is shrouded in a barrier made of menstrual blood and moonlight by the first-generation saint. As a "half-demon", Shen Xinglan loses control and thirsts for human blood on new moon nights. The wound she was bitten by the monster seven years ago also tortures her all the time. Su Wantang was originally an ordinary orphan, but was adopted by the Holy See, and her bloodline as a saint gradually awakened. As the evil spirits rampant, the two discovered that Eternal Night City hid a huge secret: the first-generation Saint and the Lord of Night signed a symbiotic contract, which required the sacrifice of successive Saints to maintain it. As twin saints, their destiny is pushed to the Spring Equinox Festival. In this festival that is related to the life and death of Eternal Night City, how will they choose, and can they break the fate of being sacrificed, end Eternal Night and usher in the dawn?
Purpose: The story revolves around the twin saints of Eternal Night City, and its purpose is to show their struggle and resistance in the desperate situation of fate. Shen Xinglan and Su Wantang faced the fate of being sacrificed, but they were unwilling to become victims of the Holy See and the Lord of the Night. Their experiences highlight the spirit of bravely facing the unknown and breaking the inherent shackles of fate. At the same time, the deep friendship between the two is also a highlight. They support each other in the dark conspiracy, explaining the power of friendship. The overall message conveys the positive concept that even if you are in a desperate situation, as long as you have hope and stick to friendship, you can overcome the darkness and usher in a bright future.