| Nanako SOS | |
First tankōbon volume cover, featuring Nanako, Yotsuya, and Iidabashi. | |
| ななこSOS (Nanako Esuouesu) | |
|---|---|
| Genre | Gag comic, magical girl, romance, science fiction, slice of life |
| Manga | |
| Written by | Hideo Azuma |
| Published by | Kobunsha (1980–1985) Self-Published (2001–2016) |
| Magazine | Popcorn (1980–1981) Just Comic (1981–1985) Sanchoku Azuma Magazine (2001–2016) |
| Original run | Initial run April 1980 – July 1985 Continued run July 2001 – August 2016 |
| Volumes | 5 |
| Anime television series | |
| Directed by | Akira Shigino |
| Written by | Yu Yamamoto |
| Studio | Kokusai Eiga-sha |
| Original network | Fuji TV |
| Original run | April 2, 1983 – December 24, 1983 |
| Episodes | 39 |
Nanako SOS (ななこSOS, Nanako Esu-ou-esu) is a Japanese manga series created by Hideo Azuma. It initially ran in Popcorn and Just Comic (both published by Kobunsha) from April 1980 to July 1985 and later continued as a Doujinshi in Azuma's Sanchoku Azuma Magazine, running irregularly from July 2001 to August 2016. The series was adapted into 39-episode anime television series produced by Kokusai Eiga-sha which aired on Fuji TV between April 2 and December 24, 1983.
Nanako is a young girl who unexpectedly acquires superpowers and at the same time loses her past memory as the unintended result of a scientific experiment gone awry. The mad scientist high school student who was running the experiment, Tomoshige Yotsuya, says he will help her regain her memories if she will join his detective agency. Nanako innocently believes him, but Yotsuya's real intent is to use her powers to benefit his agency and himself.
The story unfolds as Nanako encounters a variety of dangerous missions and mysterious events, but her natural sunny disposition helps her through all the incidents as she solves each mystery one after the other.

Eiichirō Yotsuya (四谷 永一郎, Yotsuya Eiichirō) (Tomoshige Yotsuya (四谷 智茂, Yotsuya Tomoshige) in the anime)
Enoki Films holds the rights to the series and has released it internationally under the name Nana the Supergirl.