Hanazawa Kazuma has worked for the Crown Hotel Group, Japan’s leading hotel chain, for 25 years. He gets his long-coveted title of manager and triumphantly arrives at the hotel which he has been posted to. However, Hanzawa is welcomed by fierce-looking men and foreign workers. The hotel’s owner Kido Nakazo is a big-shot yakuza. Even the guests are yakuza. Then it hits Hanazawa; the hotel is being run by Nakazo’s henchmen as a hotel that caters to the needs of yakuza who are not generally welcomed by hotels for group events, and they are unable to enjoy the large communal baths along with other people due to the attention their tattoos attract. In fact, people call this place “Prison Hotel”.