In Lupin Zero episode 4, "Construct a Secret Base," a bored Lupin drags a reluctant Jigen into building an elaborate, rebellious hangout on school grounds to escape strict supervision. This dialogue-heavy episode explores their growing friendship amidst chaotic, high-stakes antics and confrontations with authority figures.
You can find the full episode for streaming on HIDIVE and read detailed plot summaries on the Lupin III Wiki . Lupin Zero Episode 4