四釜 寿

Boss of the Shikama Group.
On the surface, the group has disbanded, but in reality it remains intact and is involved in a wide range of shady activities, including assassinations, illegal drug trafficking, and underground casinos.
Through this, he became close friends with Shintaro, the chairman of Uozumi Real Estate, and acted as a secret force for Shintaro's business, playing a key role in growing Uozumi Real Estate into a huge corporation.