I turned into a brave sister

After arriving in this magical world, Irene has been called the Flower of the High Mountains of the Magic Academy, but in fact, she became resistant because she could not accept the sudden change of gender and identity. But Irene's only relative in this magical world, his younger brother has always been cold to her, and even said it directly after meeting Irene for the first time after crossing. "You are not my elder sister." This made Irene's sense of crisis immediately emerge, and she had to face this younger brother every day with the most gentle and pleasing gesture.