The Shinmoto twins Chiko and her younger bother Chika often hang out with and their close friends; the Saitou twins Mako and her younger brother Mao. Chiko is a university student, Mako is a part timer at a cafe while both Chika and Mao are high school students. Each one of the four has a unique personality. This is an anime about their daily lives.(Source: ANN)