My Name is Zero.

Summary

In a mystical underground cave, a young lady discovers a magnificent lake and an array of dazzling weapons, including a massive heavy sword that she struggles to lift. Despite her disappointment at its size, she remains determined to fulfill her sister's task. Each day, she attempts to pull the sword, singing a cheerful song, yet it remains immovable. After her efforts, a figure named Zero observes the scene, hinting at the sword's potential and its connection to the young girl. The cave returns to silence, reflecting the passage of time and the lingering presence of Zero's influence.

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