Agasha Jiro was the son of Agasha Dorachi and Agasha Rieko. Jiro died shortly after the death of his mother, and was followed by his brothers Agasha Saburo, and Agasha Sanko. Only Agasha Ichiro remained alive, becoming the only heir of their father. Ichiro secretly had been possesed by Ichiro no Oni and forced to curse his brothers and mother to death.