Kazuma Wakao is the late patriarch of the family at the center of the story, whose death serves as the primary catalyst for the events that follow. He is the father of Kyosuke and the stepfather to Yuna, having entered into a marriage with a younger woman named Megumi, who is Yuna’s mother. Kazuma is described as a man of significant wealth, as his passing leaves behind a large estate for his surviving family.

His background is defined by this second marriage to Megumi, a relationship that his son, Kyosuke, deeply disapproved of during Kazuma’s lifetime. The dynamic suggests a family structure that was already fragile, held together primarily by Kazuma’s presence. While the search results do not provide details on his personality or motivations during his life, his death is the pivotal event that changes the household’s circumstances. He is no longer alive during the main narrative, so his role is not as an active participant but as an absent figure whose legacy and will shape the actions of the other characters.

Kazuma’s key relationships define his place in the story. He is the biological father of Kyosuke, a son who held a grudge against the marriage to Megumi. He is also the stepfather to Yuna, who wished for a proper family life after the marriage and was grateful for the new family structure, which included both a father and a brother, alleviating her previous loneliness. His death directly leads to the power struggle and the central conflict between Kyosuke and Megumi. With Kazuma gone, Kyosuke attempts to force Megumi to leave the house, leading her to propose a disturbing arrangement involving Yuna in order for them to stay. Therefore, Kazuma’s most significant contribution to the narrative is his death and the unresolved tensions it unleashes regarding inheritance, family loyalty, and control. The search results provide no information regarding his development over time, as he dies before the story’s present, nor do they mention any notable abilities he possessed.