Mirai Nikki, also known as Future Diary, is a survival game anime about a lonely teenage boy named Yukiteru Amano who discovers his diary can predict the future. He and eleven other people are chosen by the god of time and space to participate in a deadly battle royale where each person has a unique future-telling diary. The winner becomes the new god. Yukiteru is reluctantly helped by Yuno Gasai, a dangerously obsessed and violent girl whose diary specifically predicts events involving him. The story follows their struggle to survive against other diary users, each with different abilities, while exploring themes of trust, betrayal, and obsession. Readers enjoy it for its intense psychological thriller elements, brutal strategy battles, shocking plot twists, and the iconic, terrifyingly loyal character of Yuno.