Mameshiba Cubbish Puppy(2009)

Jiro (Jiro Sato) is a 32-year-old man who doesn't have a job. He lives at his parents' house and doesn't go outside or socialise with people. After the death of his father, Jiro's mother runs away and leaves behind a 6 month dog named Ichiro and some clues for Jiro. To find his mother, Jiro has to venture out into the world.