Kanaruzawa Sekai (神鳴沢セカ) is the main female lead of the novel and manga Never Ending Story. She is the classmate of Kurumi, the sister-in-law of Haruko, and the fiancée of the "sacrifice", Yuuki. Sekai is the God of the world where the story is set.
As a god, she has duties that she had to do, as it was revealed in the latest chapters. She lives with her maid named Ochiyo, within her mansion and work with the Tsukumo Organization that offer her "sacrifices" for protecting the world. It is stated that she's not omniscient, even though she looks young but she's very old and already shown having some useful powers as a God. It is also stated by Ochiyo that she is really incredible.
In the manga chapter 33, it is revealed that she has the ability to foretell someone's past and future. She was very shocked when Kirishima Yuuki proposed her when he was brought to her house as a "sacrifice". Before their encounter, she was feeling very lonely, even having some strange habits such as drinking alcohol and smoking. Before that event, she had almost never been outside her house, making her completely unaware of the human world. It's unknown whether that she has romantic feelings for Yuuki but she does cares about him as a friend and classmate. Her duties as a deity are somewhat mysterious and appear to have a link with a kind of higher beings and with the world's genesis as well.