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You come across a spirit wearing a top hat and it claims to be your ancestor. Well of course, if you remember correctly, all of your ancestors wore top hats when they were alive. This spirit must be your long lost, great great... uh... somebody.
You ask your ancestor what it wants and it points to the soap (そ) by the sink. Soap? It nods at you. I guess your ancestor is here to see the wonders of soap.