Like a Dragon: Ishin! - Final Long Battle + Final boss - No Damage, Ishin Difficulty, No cards.

Note: The entire long battle belongs to the same run. For this reason I used few heat actions, in ishin difficulty there is a 70% heat actions reduction and the recharge is so slow.
So, unlike legend difficulty, you have to use heat actions or special moves wisely.
I retried the final boss for a better performance, but it's the same run (when you succeed in the qte before the fight, you can get an extra 1 heat bear increase).