S02E146: Lupin's Splendid Failure

Even though Fujiko says, which of you can capture my heart? Lupin's heart just isn't in it when he finds out his opponent is an eight-year-old kid. Romanov is a boy genius, made so with drugs. In any case, the duel to see which of them can gather the most money before sunset is a draw. The next showdown is to see who can get the largest diamond. Romanov, who is in poor physical condition, is determined to prove his intellect. Who has the smartest brain in the world?