As a <type of user>, I want <some goal> so that <some reason>.
What is a user story? These can be as specific or broad as you want. You don't have to use the template above. You don't have to be that type of user. Write them here, open an issue, or write an email. You can also discuss the existing user stories via the same channels.
As a data hoarder, I want a way to categorize and store my library. That way I can find what I'm searching for locally.
As a degenerate weeb, I just want to read some hentai. (for research purposes)
As a paranoid person, I want to store my manga locally before Fakku (or the government) takes out another one.
As a hentai connoisseur, I want some way to find new works so that I may enjoy them.
As someone who doesn't like to put all his eggs into one basket, I'd like to be able to search multiple (if not all) established hentai sites.
As an existing hentai site user, I would like to import my library, so that I don't have to do all the work again.
As a conscious person with enough money, I'd like to know who created and/or translated a manga so I know where to put my money to get more.
As someone who doesn't trust a single application, I would like my library saved in a sensible (human-navigable) folder structure.