The School of Water Business (都立水商!, Toritsu Mizusho!) is a manga series created by Shinobu Inokuma, the author of Salad Days. It is based on a novel by , and is set in a fictional trade-school—that focuses on the mizu shōbai—located in the Kabukichō district of Shinjuku, Tokyo. The school's focus is to give students their last chance in the school system. Classes are divided into occupations such as hostesses, hosts, "managers" (from waiters to actual managers), "geibaa" ("gay bar" but is a more comedic view of males dressing and acting like females) and, finally, "soapgirls".