Yusuke Kunimo, the unlucky man in the world, is 15 years old. He failed to take the exam due to repeated misfortunes, and the only high school he could enter was Miyato High School, the worst high school in the prefecture. A fortune teller appears in front of the depressed mother, and is told that he will die within three months. The fortune-teller gives the "Future Diary" to the embarrassed Kokubo and disappears. In that diary, it is stated that the national mother suffers from bad bullying and commits suicide ...!? This story is about three years when a very unconnected man becomes a legendary big bang age against his will. It's a trajectory !!