You, an ordinary student, your life is connected to your past life because of a brooch. You and her perceive each other, help each other, talk to each other, pull each other out of the abyss of eternal destruction, and move towards the light together.
"Please... Do... Help me."
"How can I help you? I can't even save myself."
"I can give you everything you want."
"So, what does the past life have to do with me?"
Purpose: Mutual redemption