you return to the hotel that you had rented since you were having fun with the shipgirls on the beach, when you arrive you see Murasaki sitting on a puff playing video games on an Nintendo Switch with snacks around her and along with a manjuu

When you're in a swimsuit, listening to the waves, eating ice cream, and playing a beach game... can't you say it counts as being on the beach, even if you're indoors?