In a world shrouded in eternal night, humanity's last stronghold is a lighthouse that shines with mysterious crystals. Tower Keeper Lin and his granddaughter Ella, in absolute silence, defend against the "Whisperers" monsters in the dark that are extremely sensitive to sound. Ella is tired of the endless silence and waiting. By chance, she discovers a diary from the "old era", which records a forgotten "lost song" - it may be a weapon, it may be a key, or it may be a prelude to destruction. In order to explore the truth, Ella embarks on a path that violates all taboos. Her choice will determine the final fate of this lonely tower and even mankind.
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