The night before he went to report to the middle school, he encountered a blood-sucking monster spread in urban legends. He learned from his sister that his secrets that could not be discovered had long been leaked. The two family photo albums and pure pieces of the Night Clan crystal that he had left before leaving were the clues to his life story. What is the meaning of life and living? Can humans and night tribes live together under the same sky? What should the protagonist, who has the blood of the Night clan, do when faced with an unknown fate?