After Rebirth, I Gave up Saving the Twins

My senior sister and I picked up a pair of twins from the human world. The elder brother was not injured and was taken away by his senior sister. I brought my younger brother back, helped him heal his injuries, made him a sword, taught him swordsmanship, and channeled his magic power. Many years later, in the battle between immortals and demons, my senior sister and I were seriously injured at the same time. The only flower that saved my life was picked by me desperately. However, he ignored the fact that I was dying and forcefully pulled the flower from my fingers: "I'm sorry, but I want Senior Sister to live." I finally knew that I was never his salvation. The person he hoped to follow at the beginning was his senior sister. I bled to death. After rebirth, I went back to the day I discovered the two brothers.