The Father-Son Kokuho is Suzaku's ultimate attack in his Kyuubi State form he used in the final battle against Ryoku. When Suzaku uses the Kokuho against Ryoku's Gamma Ray Burst, he is spiritually assisted by his father, Seireitou. Even so, Ryoku is able to nearly overpower Suzaku several times due to his broken arm injury. However, as Ryoku prepares to finish off Suzaku, Kohaku distracts the Ryoku with an energy attack. Seeing this opportunity, Suzaku (encouraged by Seireitou) unleashes his full power, overpowering the Gamma Ray Burst and destroying Ryoku once and for all.