2girls, book, casual_one-piece_swimsuit, drinking_straw, drinking_straw_in_mouth, floating, floating_object, glasses, grey_hair, hair_ornament, holding, holding_book, lcaomei, long_hair, luna_(punishing:_gray_raven), multiple_girls, nanami:_pulse_(punishing:_gray_raven), nanami_(punishing:_gray_raven), one-piece_swimsuit, ponytail, punishing:_gray_raven, sitting, swimsuit, thought_bubble, twintails, very_long_hair, white_one-piece_swimsuit