1girl, arashiomoto, armpits, beach, beach_mat, bikini, black_jacket, blue_archive, blue_jacket, collarbone, eyewear_on_head, frilled_bikini, frills, hair_between_eyes, hair_bobbles, hair_ornament, halo, heterochromia, hoshino_(blue_archive), hoshino_(swimsuit)_(blue_archive), jacket, long_hair, long_sleeves, looking_at_viewer, low_twintails, lying, navel, official_alternate_costume, on_back, parted_lips, sidelocks, sleeveless, solo, stomach, stuffed_whale, sunglasses, swimsuit, twintails, white_bikini