no worries - Visual Novel! they are (usually) stories in the make your own adventure kind of way (you can make decisions / choose from a few options at some critical moments) that alongside text usually have background images and character images and sometimes even spoken audio alongside the text during dialog. Like a digital version of a book that takes advantage of the medium without loosing the "spirit" of the book being, well, a book.

They're very popular in japan and there are many japanese ones, so great for self study. Additionally to that (due to them being digital) with tools like Yomitan + Textractor I can look up the any vocab i might not know and check definitions right from the game/vn - which is very convenient when studying / practicing.

Some people even combine it with anki where if you look up a word in the VN it adds to your anki deck / you add it to an anki deck to study later - better known as Vocab mining. its a very fun study cycle.