What is an "Impro Manga"?

    It works like this - people sign up and each person is assigned a month. The first person gets to write and draw a few manga pages (as many as they can get done in their month) and submit them by their due date. This is the beginning of the story.
    The next person gets to go from there and make a few pages of their own, the next takes it from where that person left off, and so on.

    No one is supposed to make a beginning, middle, and end in their segment - you are just continuing the story from where it left off, and taking it into new and interesting directions.

    These things are usually a lot of fun, because it's interesting how one person can start a sub plot, and the next person can take it in a completely different direction.

    Impromangas are a lot of fun, the only thing is that since it takes such a long time for one to go anywhere (each person gets 3 to 4 weeks to work on their pages - and there are usually upwards of 10 to 20 people who make pages for these!) there really aren't very many of them around. When you do find one, they've usually stopped taking new applicants, and are already through half of their people.

Are there more of these things?