School bullying has multiple negative impacts on the physical and mental health of children, with the situation being particularly severe for rural children in China. Serious games, which combine educational and entertainment elements, have been proven to be effective educational tools. Thus, we developed an anti-bullying serious educational game for rural children, based on the Double Diamond model and utilizing AI-supported design processes. Through character interaction and clue collection, players gradually uncover the truth behind bullying incidents in the game, helping them better understand and respond to bullying. Prototype experimental results show that the game is well-received by rural children, demonstrating the potential of serious games in school bullying education and offering new insights for addressing this social issue.