Daughter-in-law turned into a devil's cave

Unable to get a regular job and at a loss after his wife ran away, Takashi moves into his parents' home where his brother and his wife live, taking their son Shota with him. His older brother Shoji and his wife Ami agree to live with him on the condition that he can find a job, but Takashi never seems to work and spends his days gambling. Shota also lived his life without knowing anything about him, but...