Mezase Gouka Kyakusen!! ~Sen Shokan Skill De Isekai Rich Life Wo Te Ni Irero~ - Vol. 3 Ch. 20 - Wataru’s Secret and A New Ship

[MangaDex]

 

[kaminomikan]

that's definitely not an S.S vessel

 

[MerlinD]

What a ship

 

[jctsoi]

For giggles I tried to google for that boat (gigayacht) and it's an actual exists and not something that was made up for the manga. Orsos Island https://orsosisland.com/