Ichiban is going to Hawaii because there's a possibility his mother is there. He runs afoul of a taxi driver who scams him and leaves him naked on the beach, but ends up befriending him, because he's Ichiban. He's a new party member, as is Chitose, someone who claims to have worked as Ichiban's mother's housekeeper. Jo Sawashiro is "back" in a capacity.
Kiryu has that "yakuza cancer" that's going around. He's just ultimately trying to do right by everyone in his life until the end. The "Jimas" are present and supporting him, but we basically see them at something that's like a cabin in the mountains? Kiryu's involved because apparently the Daidoji faction is also seeking out Ichiban's mom for reasons.
There's a bunch of rough dudes, and probably lots of fights I'd guess.
Danny Trejo is in the game as "Dwight" some kind of criminal rough dude.
What we know about the gameplay:
It's RPG style as with Y:LAD.
You can now move around a little bit in a circle before launching your attack, as opposed to the last game where you just kind of walked around randomly.
There's at least one selectable attack where you take control of the character to make it action gameplay. (Kiryu can do this)
Apart from real-life person Eri Kamataki, all party members from Y:LAD are returning. Also Seonhee (Seong-hui) is a party member now.
New jobs include but are not limited to: Boys - Samurai, Desperado, Pyrodancer, Action Star, Sujimancer, Linebacker (DLC). Girls - Housekeeper, Kunoichi, Geodancer, Tennis Player (DLC)
New Poundmates include Yuki/Koyuki, Kazuki/Yuya, Akiyama, Date, Sayama
What we know about Minigames:
Crazy Delivery - Basically Can Quest as a base but combined with BMX stunts and the idea is being a DoorDash service.
Sujimon Battles - Literally take bad guys and fight them against each other. It's flipping Pokemon baby.
Miss Match - Dating minigame that involves text prompts like Live Chat from 6.
Something involving sharks and octopi? I don't fucking know.
At least six new Karaoke songs
SEGA Bass Fishing and SpikeOut: Digital Battle Online new classic SEGA games.
Old minigames include: Can Quest, Shogi, Mahjong, Oicho-kabu, Koi-koi, Blackjack, Poker, Batting Center, Golf, Darts, Vocational School Tests, UFO Catcher, Virtua Fighter