Ayumu Arashiyama is the husband of Yukimi Arashiyama and father to Hotori, Takeru, and Yukiko. He provides the family's primary income, ensuring their livelihood. Within the household, his authority remains minimal; his children rarely obey him, and any compliance is typically reluctant. His wife similarly overrules or disregards him in domestic decisions. This dynamic leads Ayumu to view Josephine, the family's Japanese-raccoon-dog-resembling pet dog, as his only consistent ally at home. Despite these struggles to assert influence, he holds deep affection for his wife and children. Ayumu profoundly values his family life and expresses no desire for any alternative existence.