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.