She thought she was a girl without a home, she thought death was the meaning of existence, she thought that after being exiled, she replaced Heijo Gagaku, she thought she was just Asahi Hitomi; he thought he was Tsukijo Hitomi's fiancé, and he thought finding her and protecting her was the meaning of his existence. She knew that she existed as "Hiragi Gagaku" after time travel, but she didn't know that she was the person he was looking for; and he began to think that he had fallen in love with another girl and betrayed the meaning of his existence. Time erases everything, time buries everything, and behind the scenes of life and death, will she still accept him? Will she accept his love and his reasons for cheating? In the end, are they just destined to pass by each other, or will they become each other's eternity?