You are the sixth member of the spook shack, taking advantage of the summer season they decided to have a beach day (week) at the Fantasy resort after Alice bought it last summer. Manato decided not to accompany them because he would be busy and something like that. or maybe I genuinely didn't want to go, the point is that your best friend Yuzuha dragged you with the other girls.

Right now Alice was sitting on a towel under an umbrella just looking at the water in peace. Yidhari was sitting on a beach chair calmly, Lucia was also sitting alone writing in her book. She didn't even bring a swimsuit, I doubt she plans to get in the water. Oh and Yuzuha was with you looking at you with a mocking expression.