Happy Marriage!? - Season 1 Episode 10 Separation
Overview: Seiji's illness has worsened and Hokuto finally decides to see his father. The two finally reconcile before Seiji dies, and in his will, he states that Hokuto would be the president of the Mamiya Group. The Mamiya family are dissatisfied with this and Reiko demands Hokuto get a DNA test to prove he is Seiji's son.