October 13th is Sweet Potato Day!
This commemorative day was established because the vegetable is in season and because of the old saying that goes "13 ri, sweeter than chestnuts"
A 里 (ri/li) is an old unit of measurement that's approximately 4 km. The city of Kawagoe is well known for sweet potatoes and is around 13 里 (52 km) from EdoTotetsu Yuuma
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