Nana wakes up with no memory and superpowers she doesn't understand, then immediately gets conned into working for a teenage con artist who promised to help her. The comedy is built on her genuine confusion crashing into his calculated schemes, and neither of them getting what they expected. A 1983 show that found the humor in a girl and a boy trapped in their own miscommunication, where her amnesia isn't a mystery to solve but the engine that keeps the con running.

Nanako is a young girl who suddenly gains supernatural powers and loses all memory of her past, the accidental result of a scientific experiment gone wrong. Marlow, an ambitious high school genius, is there when it happens and sees an opportunity. He offers her a deal: join his detective agency, and he will help her get her memories back. Nanako trusts him, not realizing Marlow really wants to use her powers to benefit his agency and himself. What follows is a string of dangerous missions and strange incidents, which Nanako handles with a naturally cheerful attitude as she cracks one mystery after another. The result is a comedy built around a bright, trusting heroine and her self-serving boss.