 He spends time developing a friendship with Yuka at her birthday dinner and after befriending the couple, he decides to lie to his "employer" about their whereabouts.It is revealed that he's the illegitimate son of Kyūtarō Ōba and a prostitute, only known as "Nana" by her photo.He told Yuka in episode 6, that she died giving birth to him because of his size.