Ryoutsu, being an underpayed policeman, is always coming up with ways to make some quick money. But in the end, his plans which are ridiculous from the beginning always go wrong and land him in big trouble.

Ryotsu Kankichi, nicknamed Ryo-san, is a senior patrol officer working at the Kamearikoen-mae police box at Katsushika. Because of his daring, hearty, unconventional, haughty and overbearing personality, he is called "letter of apology Ryo-san" and everything he does is nonsense. There is endless trouble wherever Ryo-san goes. He makes Akimoto Catherine Reiko and Nakagawa Keiichi, his juniors from the same police box, fearful. His superior, Ohara-buchou, lives each day as if lightning will strike as a fearless power keeps going off day after day. He definitely doesn't have poor ability as a "patrolman of the police box" in the mediation of quarrels, taking care of New Year's gifts or discussion of neighbourhood problems but he has a bad temper, gets tired of things easily and detests working. He is a police officer but because he loves gambling, he spends his money recklessly and in addition to this mess, is heavily in debt. He has a weakness for get rich quick schemes, and has a manic desire and knowledge to have fun and make money. Then one day, Ryo-san receives a tempting proposition...