I think I saw this a while back, but just now did I realize an additional layer to the pun: Ashita already planning for their wedding makes perfect sense, because her name means "future". It's natural for her to think so far ahead into their future.
when I saw this image
the part where Nozomi and Eli stare at each other as the lifeboat descending and then Nozomi jump into the ship from a lifeboat to be with Eli came to my mind. Seriously, that will be so dramatic /(ㄒoㄒ)/~