The future of the game industry depends on developing contents. Especially a high level game needs all kinds of scenarios. Therefore, it is important to popularize writing game scenarios. Scientific scenario study is also needed to educate talented scenario writers and game designers. This is a case study on interactive elements of the game scenario, such as items, puzzles, and events. In conclusion, when these interactive elements becoming smoothly one parts of the game the game is now perfectly finished, rather than disturbing the process of the game story. I hope that this study is some helpful to game developers.