For three years, Akira has been saving money for a computer. When a model 9821 goes on sale, she rushes to the store but finds it sold out in five minutes. Feeling discouraged, she walks home and encounters a man in an alley who happens to have the computer she was after. Excited, she buys it and heads home, only to discover that she didn’t purchase a 9821 but a 2198, a super‑advanced biomechanical computer girl named Mimi.