Feel like making this more interesting so I'll just say my favorites from each game

Yakuza 0 - Get Them or Pledge of Demon
Yakuza Kiwami - For Who's Sake
Kiwami 2 - A Scattered Moment
Yakuza 3 - Fly
Yakuza 5 - So Much More
Yakuza 6 - The Way of Life
Judgement - The Flower of Chivalry

Couldn't think of one for Y4 😭