4girls bath black_hair blue_eyes blue_hair blush brown_eyes brown_hair copyright_name copyright_notice hanahira! hanemura_kaori kani_biimu multiple_girls photoshop_(medium) purple_eyes red_eyes red_hair same-sex_bathing shared_bathing sono_hanabira_ni_kuchizuke_wo toudou_makoto uozumi_koharu watermark yuuki_amane