In the center of the plot movie schoolboy Greg Heffli. Greg leads his diary, which records all that happens to him during the day.
In school, Greg is often hurt, the girls do not play well with him, considering it a waste of time. Houses, too, not sugar. Parents who do not understand him and his brother, who is also a lot of problems.
He is constantly in the wrong place at the wrong time. In an effort to be "cool" he experiments with weightlifting, creating his own haunted house, building a huge snowman to get into the record books. However, the "sternness" he did not add.
In fact Greg typical teenage problems, which he cynically describes the four-eyes every day in his diary.