Are bells based on yen?

Are you asking if the value of bells, as commonly used in video games or virtual economies, is somehow tied to the value of the Japanese yen? If so, it's important to note that bells, being a virtual currency, do not have a direct correlation with any real-world currency, including the yen. The value of bells is determined solely by the rules and economics of the game or virtual environment in which they are used. Therefore, the answer to your question is no, bells are not based on the yen.