The title appears to translate to something related to a manga or anime series involving a 13-year-old girl who loses her virginity, possibly set in a high school context. However, without more context, it's challenging to provide a detailed overview.
Unfortunately, I couldn't find detailed information on the plot and characters of "Kansai Enko 1 Mami Chuu 1 13 Sai Shojo Soushitsu High." If you're familiar with the series, you might know that it follows the story of [insert brief plot summary]. The main character, [insert character name], navigates [insert setting or situation], encountering various challenges and characters along the way. Kansai Enko 1 Mami Chuu 1 13 Sai Shojo Soushitsu High