Zantetsuken's Lament

Even on vacation, Goemon has eyes for nothing except swordsmanship. A girl named Naomi takes on of the iron bars Goemon had wrapped in bundles of straw for the purpose of cutting practice. Her grandfather is a swordsmith, and he wants very much to make a katana better than Zantetsuken. Naomi puts energy into her support of her grandfather, and they discover Zantetsuken's secret: the high temperature of its blade. Who holds the true legendary blade?

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S02E109 - Lupin's Toughest Fight Ever