Detective Conan is useful for English practice if you can already follow natural conversations. At an average of around 118 words per minute, the dialogue is generally manageable, though some exchanges require more attention. The vocabulary is not overly technical, though it includes enough variety to make the practice meaningful. Some parts may require more focus, but the main story remains easy to follow. The community has given Detective Conan an English difficulty rating of 6.1/10, so a B2/C1 level is recommended to learn from it effectively and enjoy the content.