Lin Rui, the sister of young illustrator Lin Wei, mysteriously disappeared in the remote and isolated Kirigakure Town. The only clues left to her were an unclear distress call and an unfinished painting depicting a strange blood-colored moon and an ancient mansion. Regardless of the dissuasion of her friends, Lin Wei went to this small town alone that was difficult to find on the map.
The town is shrouded in thick fog that persists all year round. The residents behave strangely and are full of rejection and fear of outsiders. Lin Wei soon discovered that her sister's disappearance was not an isolated incident. Every few years, people in the town would disappear inexplicably on the night of the blood moon, and all clues pointed to the century-old house deep in the town that was half burned and haunted by legends - Su House.
With the help of the diary fragments left by her sister and the weak help of the only old archivist in the town, Lin Wei gradually came into contact with the terrible secrets hidden in the town: an evil curse that has lasted for hundreds of years, a terrifying transaction with shadow creatures, and a dark truth closely related to her family. The blood moon is approaching again, the whispers in the shadows are becoming clearer and clearer, and invisible tentacles seem to be wrapping around her all the time. Lin Wei must uncover the source of the curse, find her sister, and try to break this cycle of terror before the fog swallows up her reason and the ruins swallow up her life. But she doesn't know that every step of exploration is making her the next target of the ancient shadow...
