Video - American couple did managed to leave me mark of their presence in Grotnikih

Video can be als seen at https://video.fc2.com/content/20190415ZVB12cH4 or https://video.fc2.com/content/20190415TgQh6TtP or https://youtu.be/5KePFV6-_sU  or  https://www.nicovideo.jp/watch/sm34974871