While at University, Yasunaga established his creative direction at the laboratory of Satoru Hoshino, a coterie of the avant-garde ceramic group « Sodeisha ». While pottery is often made of clay and baked in a kiln, Yasunaga takes the form of pottery using glaze for his creations instead. Yasunaga masters creativity by combining unique raw materials such as feldspars, glass and metal powders, with his own methods such as creating glazed vessels with increased viscosity which are then pit fired in sand.