Depending on which series you are watching, "Episode 156" refers to different events. Here are the summaries for the original series, Shippūden , and Boruto :
Fukasaku marvels as Naruto achieves a "perfect" Sage Mode without frog-like physical mutations, surpassing both Jiraiya and the Fourth Hokage in this specific discipline. Naruto Episode 156
Raiga Kurosuki wakes up and, finding Ranmaru unconscious, directs his rage toward Karashi. Depending on which series you are watching, "Episode