is Ryūnosuke's artificial intelligence (AI) program. Originally, Ryūnosuke designed Maid to filter and automatically reply to his cellphone messages and e-mails to save him time. However, Ryūnosuke keeps expanding Maid's AI ability. Maid is now capable of blocking and replying to a message or e-mail by her own preference, using new words she has recently learned from other messages, e-mails, or the Internet in the reply, such as when she gave Sorata solid advice for his computer game program, anticipating people's emotions with cameras, writing computer or cellphone viruses and sending them out by herself, or even hacking into Suiko's computer to steal information. The only way to distinguish Maid's message from those of a human is that she replies too quickly. Ryūnosuke lets Maid enter a social networking service, with most people who meet her not realizing she is an AI program. According to Ryūnosuke, his ultimate goal is to give Maid an artificial body and become a real human.