The heroine was originally Yagyu's sister, a girl who was ostracized by everyone. She committed suicide because of everyone's indifference, and the heroine traveled through time. I thought I got family, friendship, and love, but I didn't expect that it would all be in vain in the end.
Betrayal, heartbreak, how to survive?
Wish the world's brother had traveled through time and established a dark night kingdom.
Five years later, the heroine returned, but she became a stranger. Revenge? Or start?
Brother (brother from the original world) "I only have one sister, and I only want to give her the best. So what if I destroy the world?"