The manga generator is designed to interact with the OpenAI API to generate manga blurbs and cover images. It starts by setting up constants for API endpoints and initializes global variables. The program listens for the DOMContentLoaded event and retrieves an API key stored in local storage. It defines two main functions: getBlurb and getCoverImage. getBlurb sends a request to OpenAI to generate a manga blurb based on a given title and theme. getCoverImage uses the blurb to generate a manga cover image. The program also includes an event handler handleFormSubmission for form submission, which validates input, manages UI elements during processing, and calls the getBlurb and getCoverImage functions. The program is structured to ensure a smooth user experience by handling errors and updating the UI appropriately.