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I, in the 21st century, was a real martial artist. Once, because of my sister, I was forced to send her to visit the guardian sweetheart, but I accidentally saw a girl named Hinaisen. I fell in love with her at that time, or more precisely, her character. I once had the idea of ​​​​traveling to the guardian sweetheart to protect Hinaisen. I laughed at myself as to how I could think about time travel like a girl, until a car accident made me time travel...