While many series feature "Sensei" in the title, this specific naming convention is common in digital archives for:

: In Japanese, this means teacher or master.

: It might refer to a specific title like Sensei! or Sensei no Shokei .

If you encounter this text in your own files, you can often restore the original Japanese characters by using an Encoding Fixer or renaming the files using a tool like Bulk Rename Utility .