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The little witch Nana wandered to the earth and possessed Lin Nai, an abandoned orphan girl. This body has strange tattoos and magical talents, and carries strange secrets. On the journey to find her demon pet black cat Fei Fei, Nana was involved in many strange things, and got acquainted with a retired special forces soldier. In her cooperation with him, she solved many mysterious events, and the two fell in love with each other while accompanying each other...