When Hidaka Ikumi was young, his older brother Tomo was taken in by another family, causing the two siblings to be separated. However, at the age of 16, Tomo unexpectedly resurfaces in Ikumi's life. To Ikumi's surprise, Tomo appears dressed in feminine apparel, leaving him wondering what may have triggered such a dramatic shift in his brother's appearance, as well as what led to his sudden reappearance.