One of oOraikaOo's most notable works and also their first Rin/Len duet song. According to oOraikaOo's video description on the song escapade, he stated "Codename "L" and "R"." saying it's a spy/agent-themed song. Interpretations are opened, in several PVs, it's interpreted that the Kagamines' went out of character in order to obtain information from said subject.