第4話: グレゴールが唯一無二の生物を救出する一方、ルパン一味は街で財政難に直面する

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A creature that is neither a monster nor a youkai was picked up by Gregor. Lupin, Fujiko, and Jigen, when they grow up, go out into the city and start working... Eventually Gregor's house overflowed with gold... (Source: Lupin III Wiki)