Hina lives at the same home as Rin Namiki, Misa Aoi, and at least three other girls. Her mother Minato Tsuruno owns the house, and Hina does all the cooking for the residents. When Rin is in need of members for her Jet Racing Club so that it can become an official club, she convinces Hina to join by offering her food. (Source: Kandagawa Jet Girls Wiki)