Hey kiddo! Doujinshi is a fancy word that means fan-made comics or manga. So, you know how you like to draw pictures and make stories about your favorite shows, movies and games? Well, grown-ups do that too! They create their own stories based on characters and settings they love, but the drawings and the stories are all new and different from what the original creators made.
Doujinshi can be really popular, and some people even sell them at events called “comic market” or “comiket”. Lots of people go to these events to find and buy doujinshi that they like, and it can be a fun way for artists and fans to share their work. But, it's important to remember that even though writers and artists come up with their own stories using other people's creations, they still respect the original work.
So, that’s what doujinshi is all about, kiddo! It's a way for people to express their love for their favorite characters and worlds, while also being creative and making something new.