The Awakening Card Turns Out to Be My Sister

My sister died because of me, but on the day I turned sixteen, she became my unique card. In this world where everything is stuck, her ability is determined by her ideals and is recognized as an "abnormality". In order to find out the truth, I formed an alliance with an elf girl who had lost her relationship and had the card of God, and went to Starry Sky Academy together.