[Reticent and weak-willed girls are creatures who can't talk to anyone] Sakura, who has big breasts and is suffering from stiff shoulders, is introduced to a personal gym for exercise therapy run by her father's friend.Her shy personality began to go to school with peace of mind when she heard that one-on-one guidance was given, and her physical condition improved, and her parents thanked her teacher and trusted her daughter.Under such circumstances, the body touch intensifies day by day, and the mischief escalates as it falls into a situation where it can not escape due to insidious threats.