Soichiro Niimi, a third-year student at Suwa University of Art and Design and a member of the sculpture department's laboratory, is pursuing beautiful breast and creating works in search of an ideal female body, but one night he is attacked by a yokai and meets a shadow princess who exterminates the yokai. She needs a plastic body to operate in the human world, so Soichiro decides to create her body! This is a buddy action story between an eccentric art student and a funny yokai!