An ordinary office worker died in an accident. Retaining his memories, he was reincarnated as a girl into an alternate world where humans and demons are at war—as a cursed child with white hair and red eyes, known as the "demon's mark."

Having closed off her heart due to an unwanted second life and the harsh environment of discrimination, she—who was once he—ironically recovered her frozen emotions upon losing her most beloved. It was sorrow, and it was rage.

With the flames of hatred smoldering within her powerless body, and driven by a desire for revenge, a demon's hand reaches out to her. She makes a choice.

――――to live as a true demon.