There are some quite entertaining details.

Remi with snorkel and swim wings is priceless.

She also has flippers, but Sakuya is carrying them.
And Flan is pulling off Meiling's bottom..

I had to look for a few moments, before I realized that it's a surfboard Meiling carries.

It's also definitely one of the better "Red Scarlet family" pictures I've seen.

Astrojensen said:

It's also definitely one of the better "Red Scarlet family" pictures I've seen.

Agreed.

The casual, slice-of-life, comical atmosphere it has is great, and it's subtle comedic touches are right on point, too.