It’s simple, this is the one set between Yakuza 6 and 7 but also during 7 and then between 7 and 8, where you play as Kiryu from the first 7 games but not going under the name of Kiryu as he went into hiding after 6. Oh and this game is an action game, but the next game in 2024 also starring undercover Kiryu and also the protagonist of 7, Ichiban is a turn based RPG. See simple, lol.