Michiyo Yamada is Hanappe Yamada's mother. Her MILF-type appearance attracts the demon Ophisto Bazooka, who specifically targets older women. Shortly after manifesting in the Yamada household, Bazooka sexually assaults her by ripping off her clothes despite her protests. She subsequently enters a sustained sexual relationship with the demon. When her son Hanappe attempts to stop the demons' activities, she actively resists his intervention and expresses contentment with her new situation. Her family participates in rituals centered on the "Akuma Dan" (demon altar), where daily activities continue alongside her ongoing sexual encounters with Bazooka. Her husband shows indifference to her involvement, focusing solely on the material benefits derived from the demons' wealth. Following Hanappe's suicide attempt, she joins other family members in consuming his body, resulting in their transformation into grotesque abominations. This narrative point is noted as potentially overlapping thematically with Violence Jack Evil Town but remains documented within her story arc.