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The story takes place 500 years ago and 500 years later. An ordinary high school boy lives an ordinary life. Until one day, a girl who claimed to be an angel appeared in front of him. Her appearance brought major changes to his life, and his body also changed (♂→♀) How should he face his new life as a girl?

Although he is so cute, he is actually a boy, but Haruka is troubled by his appearance, but he is forced to come to a different world with swords and magic because of being involved in urban legends. He thought he would become a savior like the protagonist in the novel, but unexpectedly he became a being who destroyed the world. In the final decision, how will he choose...