Her name may be a reference to the similarly-styled policewoman character named Erika Chinen from the videogame/OVA series Virus Buster Serge, which Masami Ōbari previously did work on.
The title track Rainy Day and Day was the opening theme to Television Tokyo Channel 12, Ltd.'s 1997 anime series Virus Buster Serge.
Serge Gainsbourg | virus | Buster Keaton | Serge Lifar | Buster Brown | West Nile virus | Buster Crabbe | Serge Reggiani | Buster Mathis, Jr. | Buster Williams | Serge Chermayeff | RNA virus | Monster Buster Club | Herpes simplex virus | computer virus | Serge July | Human T-lymphotropic virus | Computer virus | Buster Olney | Virus | Serge Tcherepnin | Serge Fiori | Serge Danot | Serge Crasnianski | Prince Buster | Operation Buster-Jangle | Influenza A virus subtype H1N1 | Herpes Simplex Virus | Ebola virus | Buster Douglas |