从大型事务所独立已有4年，事务所“Rafale”的代表井冈咲（柴崎幸 饰），终于为旗下王牌演员F争取到了夙愿已久的地面波电视剧主演机会。可就在此时，一个消息突然传入井冈耳中 —— 某周刊杂志告知她，将刊登这位王牌演员F的“婚外情丑闻”。
该报道的撰稿人是平田奏（川口春奈 饰），她正是那本曾将无数艺人的丑闻曝光在阳光下的《周刊文潮》记者。
距离杂志发售，仅剩72小时。
围绕丑闻是否刊登，事务所与周刊杂志之间的激烈较量正式拉开序幕。
而隐藏在丑闻背后的新事实，正将他们一步步拖向演艺圈更深的黑暗之中 ——
因某人的一己之私而扭曲的事实、以及接连浮出水面的全新真相。
在艺人丑闻的背后，那些暗流涌动的图谋，究竟会将她们引向何方？

Massan is based on the lives of Masataka Taketsuru and his wife Jessie Roberta "Rita" Cowan, a Scotswoman Taketsuru met while studying abroad.

Hanai Sota is 22-years-old and a university student in the veterinary department. Since he was little, he has always loved animals. His apartment is full of animals that needed help. One day, Hanai Sota saves a dog that was being used in experiments. To save more of the animals, he sets up the "Inubu" club. His friend Shibasaki Ryosuke, among other people, joins the group. Shibasaki Ryosuke also loves dogs and is a student in the same veterinary department as Hanai Sota. They work hard to protect the animals. 16 years later, a report comes out. The report is about Hanai Sota, who was arrested.