I've made millions of mangas before ... their all just about two chapters though lol
Mostly based on what happens in school
But if I were to make a real one, it would be on a girl who is watching this anime ep. on the computer & then she gets sucked into the computer & she becomes friends with the main character & soon she IS the main character & to come back out, she needs to do something real dramatic ... I haven't gotten the rest yet. There's still a few bugs, lol