Byakumaru, who achieved great sales as a supermarket manager in a rural town in the Kanto region, received a special bonus of 1 million yen and a three-day vacation. Byakumaru decides to use the bonus and vacation time to reunite with his older sister, who he lost in his childhood. His parents died in a traffic accident, and he grew up in a relative's home, but was later placed in different homes and his whereabouts were never known. As a result of the investigation by Koshinsho, there are four housewives from Shiromaru's area living in a certain housing complex in Tokyo, and one of them appears to be Shiromaru's older sister. Shiromaru heads to the housing complex with Ayaka, an employee of Koshinsho, but...
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