Mari Kode is a teacher at the school attended by the main protagonist Himeko Tsubaki. She has a contentious relationship with Aoi Misuzu, as the two frequently engage in arguments or conflicts. Mari Kode is also indirectly responsible for the attention that Himeko receives from the antagonist Chief X, as her actions or associations led Chief X to begin following Himeko. Beyond these points, little additional detail is available in reliable sources regarding her background, personality, motivations, development, or notable abilities.