The title of this Kancolle one-shot Oka no Ue no Gunkan (“Battleship Above the Hill”) is likely a play on Saka no Ue no Kumo ("Clouds Above the Hill"), a Japanese historical novel by Shiba Ryōtarō originally published from 1968 to 1972 in eight volumes. A thirteen-episode television drama based on the novel aired on NHK from 2009 to 2011.