The concept of female same-sex relationships in Japan dates back to the 17th century, during the Edo period. Literature and art from that time period often depicted women engaging in romantic and intimate relationships with one another. However, it wasn't until the 1990s that the term "Bishokuke" gained popularity, particularly in the Japanese lesbian community.

In Bishokuke no Rule, the concepts of "senpai" (upperclassman) and "kohai" (underclassman) play a significant role. These terms, borrowed from Japanese school culture, refer to individuals who are more experienced or less experienced in the context of same-sex relationships.

The term "Bishokuke" is derived from the words "bishoujo" ( beautiful girl) and "kuke" (to make love). It refers to women who are attracted to other women, particularly those who identify as lesbian or queer. Over time, the term "Bishokuke no Rule" emerged as a way to describe the unwritten rules and codes that govern these relationships.