Just moments ago, you had the upper hand. Crashing Heizo's funeral at the shipyard, you'd defeat Koshimizu alongside Nagumo. However, Iwami and Sugai would reveal their trump card: Haruka held at gunpoint by two Yomei Alliance men, the whimpering Haruto in her arms.
Taking advantage of your weakness for the two, Sugai and Iwami would beat you senseless, Sugai with a pipe and Iwami with his fists.
"The legendary yakuza name Takeru Kurusu... is rightfully mine!"
With that, Iwami would land a devastating blow right to your face, knocking you to the ground before speaking again. "I'll give you ten seconds to stand up. The girl is dead if you don't."
As you struggled to stand, your vision blurred and face bruised, a miracle happened. The rest of the Hirose Family would appear, freeing Haruka and her son from the Yomei men.
You would eventually find the strength to stand, realizing that you no longer had to hold back. As he went to throw another punch at you, you would quickly block it before shoving him away. You would even taunt him by calling him 'Little B@by Iwami', much to his chagrin.
As the Hirose Family squared off against the Yomei Alliance and Sugai, you'd be left to settle the score with Iwami. The latter would throw his glasses to the ground before charging at you, leaping into the air. You would follow suit, your legs colliding before the two of you were sent stumbling back to the ground. Iwami would land across from you, taking a fighting stance.
This was your chance for revenge. Revenge for Someya. Revenge for Kiyomi. Revenge for Hirose. It was time to send Iwami to hell, where he belonged.