ひみつシリーズ
Manga
The Gakken Manga Himitsu Series is a line of children's educational manga published by Gakken from 1972, with titles of the form 'The Secret of ...'. Since 2003 it has been succeeded by the Shin Himitsu Series.
Translated from the Japanese Wikipedia article, available under CC BY-SA 4.0. Translated and shortened by ManhWatch AI; may contain errors.