At the age of 35, Tsubasa Hikoichi (Tsuyoshi Kusanagi) is a senior gangster who has lived in the underworld for nearly 20 years. He belongs to the underworld organization Hayabusa. Today, as the country gradually intensifies its efforts to crack down on underworld forces, Hikoichi does not change his hard-line style, and he moves forward alone with the spirit of chivalry and justice that even the underworld people have abandoned. With the death of the eighth generation leader of Hayabusa, Hikoichi longed to become a new generation of Wakashira, but was arranged by the new generation president, Gensuke Takayama (Ken Matsudaira), to go to an elderly care institution for "training". It turns out that the traditional way of making money for the gangs in this era has become difficult. Takayama keenly sees the huge business opportunities behind the aging society, which is also the best way to consider the organizational strength and business acumen of the new generation of cadres. Helplessly, Hikoichi "airdropped" to the Sun Nursing Home and worked with the director Yasuhiro Sonozaki (Ren Osugi), who was born as an ordinary person, and the newcomer Haruna Misora (Riisa Naka). While getting along with the group of lonely and defrauded old people, Yan Yi's heart, as hard as ice, slowly melted...