The girl who appears in this work doesn't just have big breasts. They have an overwhelming sense of weight, a perfect shape, and softness. In section 1, when she shows off her breasts in public for the first time, all the staff there open their eyes wide in amazement. Being modest and shy, she has lived her life without realizing the value of them. However, from now on, her environment will change dramatically. The first step is this work, Haruna Kase AV debut.