Jin starts World War 3 to awaken Azazel earlier then he was suppose to, because he wanted to end the devil gene for good, which fails cuz Azazel in spirit form was still alive, later to be sealed in Zafina arm
The war made G Corp led by Kazuya seem like the heroes, he offers a bounty for Jin head to people, Jin as response announces the 6th tournament, which you wont hear any details about ever, not even main story or later games
Scenario Campaign is your main story, a beat them up, that gets boring at times and dragged out at times, which you are forced to complete each stage if you wanna unlock other characters for their own story, reduced to no more narrator, kinda long texts and just 2 characters till you fight Jin and then Azazel
Most endings in the game are not as good as the previous games, depending on your sense of humour, most endings might not be funny to you as a bunch are comedy endings
Lars gets to be the main character of the game, which later you find out to be the illegitimate son of Heihachi, when he recovers his memory at that point, cuz he gets amnesia from a Jack 6 doing a kamikaze on his team, falls in love with Alisa from about 0 moments on screen, just implying that, also makes you care of characters you barely knew dying
Character episodes, are 1-2 pages of wall of text, not all characters get these just a select few, DLC legacy characters dont get any at all, its just 1 fight, most are very short, comedic again, lame and you dont get shit in terms of story or character for a bunch, especially new characters
Main story is kinda short even compared to Scenario Campaign, Akuma added in the story was sorta pointless, gets hired as a hitman basically on Heihachi and Kazuya before original Tekken, waiting on them to be strong in this game, details on why he owns Kazumi a favor is simply "she saved my life, all you gotta know", in Tekken 8 its obvious his task to kill Kazuya failed bad
The narrator for the main story is very monotone, makes it boring to listen on him, even the only scene with suppose non monotone talking is still monotone, Jin is in a coma for the whole story, besides end credits scene leading up to Tekken 8
The 7th tournament announced by Heihachi at the start, its cancelled mid story and only like 4 or so character episodes tackle it, with their singular fight, no details or anything of it in general