Virtual Reality ... but not really mmo (pretty interesting though) http://www.mangago.me/read-manga/amatsuki/
http://www.mangago.me/read-manga/kanata_kara/
the girl go in another world ;) and it's complete
sorry, just remembered yureka and 1/2 prince arent completed...
I want to find to find something with at least 10 chapters an that has either an trveling worlds theme, grender bender theme or virtual reality mmo theme. Please send suggestions.