The ハーメルン開いたところ覚えるくん is a Chrome add-on designed for users of the web novel posting site Hameln. This free tool remembers the last page read for each novel, allowing users to easily track their reading progress. When browsing through rankings, it displays the last opened page, providing a convenient way to resume reading.

With this plugin, users can access their last read location even after a break from a novel. The last opened pages are saved to the user's Google account, ensuring that this information is accessible across different devices. This functionality enhances the reading experience by making it easier to continue from where one left off, thus improving overall usability for avid readers on the platform.