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[SOD female employee, General Affairs Department Secretary Section, Yoshino Moriya, takes on her first drama challenge!] One day, her younger brother suddenly arrived with a large amount of luggage. Despite being pushed around by his free-spirited nature, the older sister couldn't leave him alone, and they began living together. However, due to a certain incident, she started helping him masturbate. Even though they are siblings, things began to escalate more and more...
