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For the three people wondering, the cruise ship seen in Episode 5 of Mayonaka Punch is very clearly the Diamond Princess, a 2004-built Grand-class ship operated by Princess Cruises.

In fact, besides the front art, both ships are a 1 to 1 match. Diamond Princess is also the only Grand-class ship sailing out of Japan.

Diamond Princess is well-known as the first ship to have a massive COVID-19 outbreak (at one point its case count was comparable to countries like the US), and the ship that shut down the entire cruise industry during the early days of COVID (things are mostly back to normal now).