Oyaji (親父) is a manga series by Moriyama Tsuru. It was serialized in Big Comic Superior.
Living in poor neighborhoods of Osaka, Kumada watch over his wife and two young children. He is huge and riddled with scars and he works hard, smokes and drinks of sake as if it were mere water, gruff and scary, he talks little. But Kumada deeply loves his family and will protect it at the peril of his life when members of a yakuza clan set on fire to his house to facilitate a real estate transaction. Jailed for the murder of those who failed to burn his people alive, Kumada was released fifteen years later and found his family. He will have to face the distrust of his children who know nothing of their father except that he had abandoned them. But he is determined to regain control of their education, starting with his son, a urchin abused by the tough guys of the district.