Senjougahara, Father

He is a part of the Senjougahara family, whose life changed when the young Hitagi was diagnosed with a life-threatening medical condition. Although Hitagi managed to survive the ordeal, Hitagi's mother joined a cult out of desperation for ensuring Hitagi's safety; ironically, this also dragged the mother's attention away from the rest of the family. Years later, when Hitagi was struck by an oddity that left her almost weightless, five conmen who promised to cure Hitagi's condition left the family penniless. Hitagi's mother leaves the family for good since then, leaving behind her husband in debt while he struggles to earn a living for Hitagi's sake.

(Source: Bakemonogatari Wikia)