After Rebirth, My Sister and I Exchanged Superpowers

After the zombies arrived, my sister and I both got supernatural powers. Between metal powers and healing powers, she decisively chose the more powerful former. And I was forced to choose healing. While she led the team to search for supplies, I was blowing on the air conditioner in the base's medical station. While she was fighting in the sea of ​​corpses, I slept in the arms of the base leader. Her clothes were stained with blood and brains, but I was always dressed in white, spotless. Finally, I was pushed into the zombie group by her. When I opened my eyes again, my sister and I were reborn to the day we chose our powers. She chose the healing power first: "It's my turn to enjoy the blessing this time!" I smiled and said nothing. She thought why the air conditioner at the medical station had not been turned off for years, and where did the people who disappeared inexplicably in the base go?