IF7-R (Also known as Inner Fighter 7- Revolution) is a machine that allows you to fight reminisced bosses in a form of a fighting game. This machine was created by Dr. Minamida in Yakuza 4.
You must input enemy information before you play. This can be obtained through defeating bosses encountered through your story. The boss fight is now unlocked and you can pay 10,000 to fight them.
After you defeated an enemy, you will be rewarded with a Health or Heat boost from each enemy. Afterwards defeating one of the enemies again, you will be rewarded with an item listed bellow
Super High-Voltage Battery
List of Enemies in Yakuza 4 Edit
Thunder's Shadow Edit
Masaru Ihara: The first boss Akiyama fights at the Beginning. Can be fought in Chapter 1.
Deadly Demon Edit
Midorikawa: The second boss Akiyama fights in Chapter 4.
Guardian of Rage Edit
Saito: The first boss fought by both Saejima in part 2 Chapter 1 and Kiryu in part 4 Chapter 1.
Flaming Jester Edit
Daisaku Minami: The third boss Akiyama fights in part 1 Chapter 4.
Cold-Blooded Fist Edit
Junji Sugiuchi: The only legit boss Tanimura fights in part 3 Chapter 4.
One-Eyed Demon Edit
Goro Majima: The third Boss Saejima fights in part 2 chapter 4.
Wind Phoenix Edit
Shun Akiyama: Can be obtained after all of the Protagonists meet in the final chapter: Requiem.
Iron-Armed Tiger Edit
Saejima Taiga: Can be obtained after all of the Protagonists meet in the final chapter: Requiem.
The Wall Edit
Masayoshi Tanimura: Can be obtained after all of the Protagonists meet in the final chapter: Requiem.
Legendary Blue Dragon Edit
Kiryu Kazuma: Can be obtained after all of the Protagonists meet in the final chapter: Requiem. After you defeated Legendary Blue Dragon with Akiyama, Saejima, and Tanimura. They will learn 2 Heat actions from Kiryu.
Ability Rewards: Edit
Akiyama: Essence of Pole Dancing, Essence of Jumping
Saejima: Essence of Knock Down, Essence of Head Press
Tanimura: Essence of Hurling, Essence of Reversing.