During the first few episodes of Shimoneta, thousands of background characters are introduced, the majority consisting of students. Among these students, one in particular seemed to receive a significant amount of attention; a petite brunette who at the time carried no name. In later episodes, due to her sudden popularity amongst fans, she became known as Binkan-chan and was integrated into the supporting cast of characters. "Binkan" is Japanese for "sensitive", most likely referring to Binkan-chan's significant vulnerability and reactions to lewd and sexual images and scenes.
The series' erotic terrorist group "SOX" apparently stands for "Sex Often happens in X-Mas," X-Mas of course referring to Christmas. Outside of the series, SOX can easily be identified as a form of the word "Sex". The only reason SOX is spelled with an "O" is because that is what they use to censor words in Japan.
The logo for the 'terrorist' group, SOX, has it's "O" comprised of the symbols for the male gender and female gender, most likely to symbolise the most common form of what they stand for: sexual interactions and dirty jokes.
The character Otome Saotome physically resembles a little kid, yet has the speech mannerisms and vocal patterns of an old lady. This was intentional to create a humorous contrast between her appearance and personality.
Final anime to feature Miyu Matsuki, prior her death on October 27th 2015, at age 38.