She was originally a female college student in the 21st century. Due to long-term depression, she wanted to commit suicide and end everything for herself, but she accidentally traveled to another world and met her savior. The two healed each other, and she died in order to help him escape from the clutches of the devil. In order to resurrect her, he did whatever it took, including giving up his own soul, just to get his lover back...
Even if I forget you, my soul and body still love you and cannot forget you.
Intention: Treat the future with new emotions