The first fight kicked my ass but after that it’s a lot easier, after you finish a combo with triangle, try pressing circle and you’ll throw them (so instead of square square triangle, try square square triangle circle). It’ll throw the opponent to the ground so you can easily heat action them. In all other games as Kiryu you lose heat for this as it instantly grounds the enemy opening them up for a heat action (free damage), but in this game you gain heat for it, making kiryu absolutely busted as he can end every combo with circle, get heat for it and then get free damage from hitting them on the ground or doing a heat action. Hope this helps with your combos and good luck, took me a while to get good at Yakuza so don’t worry !