From the get go, run up to Gorilla Mask and keep punching. Attempt for guard breaks but if you miss it and get broken instead, duck immediately to cancel your recovery time and resume punching ASAP. He's only at LV 3, so as long you're fast enough your punches (left jabs are most effective) will end up countering him. Repeat it until you get in a guard break near the wall and then spam High Side Kick cancels until you refill enough TP. Then, unleash godhand.