The game's plot is Ness going through a mental breakdown. The overall tone of the game would be the darkest the series has seen, and I think the art style of the games were done because of the happiness of the games. Even when they were dark, they still maintained a sense of humor. However, in this game, it's extremely dirty and gritty. The detailed plot is that a grown up Ness finds out Paula and Poo are dead. After this, he just becomes sad and angry, and does a number of things to some of the original's locations and some of the people.