Natsu, who is sober and inconspicuous, has a timid personality that cannot be refused. One day, she confesses to Sato, who is in the same department, and they start dating. She usually wears plain glasses and has unkempt hair, but the department manager sees Natsu who finds her attractive, and the next day, her excessive sexual harassment begins. Natsu, who can't refuse, gradually develops breasts and immediately falls into pleasure as she is trained in her constitution.
