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On the surface, she was an elegant girl since she was a child, but her parents died in a car accident and she grew up alone. She encountered many difficulties while growing up. In an accident, she lost her hearing. She could no longer hear any touching and beautiful sounds. She persisted until she had a lucky time. In fact, she is a high school student who disguises herself as a boy and becomes a powerful hacker Z who uses the Internet to hunt down criminals. But when people found out that "he" was a girl, the whole country went crazy! Later she encountered a very devilish place...