1girl, bare_shoulders, bathtub, blue_archive, blush, breasts, collarbone, covered_navel, feet_out_of_frame, halo, head_wings, holding_own_arm, indoors, koharu_(blue_archive), long_hair, low_wings, new_school_swimsuit, one-piece_swimsuit, open_mouth, pink_hair, red_eyes, school_swimsuit, shiu_kyu, small_breasts, solo, standing, swimsuit, twintails, white_one-piece_swimsuit, wings