Substories contribute a lot to Like a Dragon: Infinite Wealth. A series staple since the very first game, "substories" are what Yakuza calls side quests. They may be brief, one-off encounters with strangers, or game-length struggles against recurring enemies. Whatever each one happens to be, as a whole, they're a big part of each Yakuza game's character. Substories introduce some of Infinite Wealth's wackiest characters, strangest mechanics, and weirdest scenarios.

https://screenrant.com/like-dragon-infinite-wealth-best-substories-complete-asap/