Nanako SOS (ななこSOS Nanako Esu-ou-esu) is a seinen manga series created by Hideo Azuma which ran in Popcorn and Just Comic (both published by Kobunsha) from April 1980 to July 1986. The series was adapted into 39-episode anime TV series produced by Kokusai Eiga which aired on the Fuji Television network from April 2, 1983 to December 24, 1983. Azuma created additional manga stories which ran in Azuma Magazine from July 2001 to July 2004.

Enoki Films held the North American distribution rights of TV series, under the name Nana the Supergirl, though the series was never aired in North America. The TV series has also aired in Italy, France, Germany and Russia.

Plot:
ana, 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. Nana innocently believes him, but Yotsuya's real intent is to use her powers to benefit his agency and himself.

The story unfolds as Nana 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.
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Well, a golen oldie brings smiles to everyone...she really likes Yotsuya because you REALLY gotta love someone to look beyond...that hair. Also goes to show love knows no bounds. To be fair...her outfit is too short, at least for my taste...

And also TOHRU FURUUYA aka Pegasus Seiya and the old voice of Mamoru Chiba. Feels a bit over the top graphics and antics but it's original.

Disgracefully it's a bit hard to find the eng subbed and not Italian dub. As I find it, I will post it here.