In 1979 Tokyo, four distinct sisters uncover their aging father's affair, causing their happy facades and bottled-up emotions to slowly unravel.

The appearance of a mysterious little boy interrupts the quiet, predictable life shared by an artist with autism and his caring older brother.

Taken in by the yakuza at a young age, Kenji swears allegiance to his old-school boss, pledging to adhere to the family code amid ever-changing times.