Plot[]
Volume I[]
Jin appeared when he took Basara to meet his new stepsisters. He acted calmly during their first meeting, something that worried Basara since his future wife hadn't come yet. So Basara asked Jin for an explanation, and he casually replied that the girls' mother isn't coming since she's on a business trip. Basara was confused, but then his father explained to him that they were going to live together for one week in order to know if they can coexist. Six days later, he and his son moved in order to live with Mio and Maria and the first two days passed peacefully. But Jin had to go on a business trip too, so he left Basara in charge, giving him their first family picture.
Later, when Basara found out the truth about the two girls, Jin called him and explained the situation and the reason why he decided to take care of these two girls.
Volume III[]
Later, Jin is seen inside of the demon lord castle sitting on his throne casually. He states how it's an honor that the demon lord knows his name then proceeds to engage in combat with him.