Kira, Sakuya

吉良朔夜

Sakuya died in a car accident alongside his mother when he was six years old. However, the spirit of Alexiel's seven-bladed Holy Sword, Nanatsusaya, saves him. The two strike a deal: the sword's spirit takes control of Sakuya's body, while Sakuya commits to growing smarter and reading many books. Additionally, Sakuya makes the sword promise to cause his father to hate him, ensuring that his father will feel no grief when Sakuya eventually dies. Within Sakuya resides the soul of the demon Lucifer, who assumes the form of Nanatsusaya. The Sword has followed and protected Alexiel through every one of her lives because he loves her. Later, Lucifer is set to reawaken, yet he retains memories of Kira Sakuya and Nanatsusaya. Despite his attempts to suppress these memories, he still regards Setsuna as a friend. He uses a sword named Shiranui.