The Big Swell has a pretty interesting story. It starts off as the gang deciding to have a day off in order to really enjoy their vacation before they come across the new dungeon. There's only 25 floors in this dungeon so that's 5 Sectors each with 5 floors which is great because that means each of the first four floors definitely have a hostage for you to rescue and then the fifth floor will be your boss battle. Just beware because there are no save points before the boss battles like in the other 2 dungeons. After each sector you will then be treated to a bonding experience for the gang.
I made this edit to kind of play out like a full movie experience so I purposely left out the mundane dungeon crawling portions and only included the boss fights to go along with all of the dialogue scenes since there's nothing spectacular about the other 20 floors. If you've seen and played the Hawaiian Haunt and the Yokohama Underground then you know exactly what the gameplay mechanics are.
0:00 Opening Scene (Revolve)
0:53 A Day at the Beach
3:12 A Mysterious Discovery
4:18 Entering The Gauntlet
8:22 Entering Sector 1
9:53 Sector 1 Boss Battle
20:32 Sector 1 Complete
23:30 Sector 1 Celebration Cutscene (Joongi's Dinner Plans)
33:15 Sector 2 Boss Battle
40:24 Sector 2 Complete
42:10 Sector 2 Celebration Cutscene (Gone Fishing)
51:43 Sector 3 Boss Battle
1:04:04 Sector 3 Complete
1:05:10 Sector 3 Celebration Cutscene (Red Light Stakeout)
1:15:06 Sector 4 Boss Batte
1:20:29 Sector 4 Complete
1:23:20 Sector 4 Celebration Cutscene (Girls Brunch)
1:35:47 Entering Sector 5
1:36:24 Sector 5 Boss Battle
1:45:40 Sector 5 Complete
1:47:20 The Big Swell Complete, Final Scene
Enjoying the video and you want to see more? Check out my Playlists for the rest of my Like A Dragon: Infinite Wealth uploads featuring gameplay in both Original Japanese and the English Dub.