Believing his boss double-crossed him, recently released gangster Yasuo is on his way to find the betrayer, but before setting out, he asks Kenji to care for his mentally challenged sister and a mysterious black bag.

Abandoned by his mother, Kenji scrapes out a meager existence doing odd jobs, including driving bar hostesses and their customers home. Besides this, he cares for the sister of an incarcerated friend and a young illegal immigrant. Eventually, his life reaches a turning point.