However, Omatsu drops her Hozonoogaki (a small box to store an umbilical cord with the information of the baby written on it), which is found by Sagoemon, who happens to be there, and it is disclosed that Omatsu is an older sister of Sagoemon's second wife and has been expelled from her home for her loose morals.
だが、居合わせた佐五衛門にお松が落した臍のお書きを見とがめられ、さらにお松は佐五衛門の後妻の姉であり身持ちの悪さに故郷を追われていたことが分かる。