Most Japanese curry is based on UK-style curry. In recent years, "spice curry" originating in Osaka, which contains a large quantity of whole spices. There is also "soup curry," which originates in Sapporo, Hokkaido.
Many popular dishes combine curry and other ingredients, such as curry noodles, curry soba, and curry ramen.
People at sea in Japan's Marine Self Defense Forces have the custom of eating curry every Friday. This is so they can retain a sense of the days of the week.