Reiji Kikukawa, who has a strong sense of justice, graduated from the police academy with the lowest score ever. He becomes a police constable, but is suddenly fired by the Police Chief due to "disciplinary" issues. In actuality, the firing is part of a carefully orchestrated plan. Reiji is ordered to become a "mole," an undercover cop. His target is Shuho Todoroki, the boss of the Sukiyakai gang. The group is the largest crime group in the Kanto area. Masaya Hiura, who works as a young boss of a Sukiyakai affiliated gang likes Reiji. While going through various hardships, Reiji works his way towards Shuho Todoroki.
A 40-year old man sees his life change when his wife gets pregnant. He already has a daughter from his first marriage whom he rarely sees and two step-daughters, from his wife's first marriage. The youngest of his step-daughters is looking forward to a baby brother or sister, but the oldest doesn't welcome the news and suddenly decides that she wants to live with her father. And as if that were not enough trouble, he is forced out of his good office job into an inferior position.