Crazy Diamond is Unbreakable, Part 4(クレイジー・D(ダイヤモンド)は砕けない その④Kureijī Daiyamondo wa Kudakenai Sono 4), originally I'll Be the One to Decide This!(決着はオレがつける！Kecchaku wa Ore ga Tsukeru!) in the WSJ release, is the four hundred thirty-first chapter of the JoJo's Bizarre Adventure manga. It is also the one hundred sixty-sixth chapter of Diamond Is Unbreakable.