Yuuki has been assigned as a Japanese language teacher at one of Tokyo's leading preparatory schools, but by chance, ``I'' catches on to his one-time affair with a fellow teacher. Since then, he has been trained to follow obscene orders using this as a material. Introducing the Big Breasted Pet series, where you can play with the big breasted female teacher to your heart's content in completely subjective videos! The first part is Yuki Sakurai, a beautiful mature woman with big breasts and K cup.