1boy, 3girls, alternate_costume, aris_(blue_archive), arona's_sensei_doodle_(blue_archive), blue_archive, blue_eyes, blue_hair, breasts, collarbone, dark_blue_hair, halo, headband, hoshino_ouka, looking_at_viewer, midori_(blue_archive), momoi_(blue_archive), multiple_girls, one-piece_swimsuit, one_eye_closed, school_swimsuit, sensei_(blue_archive), siblings, sisters, small_breasts, solo_focus, swimsuit, twins