Due to an accident with a futuristic learning program, Yui Kasuga makes contact with an artificial intelligence. That AI contacted her, because another AI on a supercomputer nearly killed its creator and is now trying to get control over eight AI systems controlling the internet. Somehow, Yui might be able to stop him. Because of this, she is tasked to enter the virtual reality, adopt the avatar of a female superhero, defend the net and find the control systems, which are masqueraded as other systems and services in the net.