Tokyo shares jumped 1.6 percent on Tuesday, propped up by gains on Wall Street and a breather in the yen's rise amid US-Iran tensions.
The Nikkei 225 index, which lost nearly two percent on Monday, bounced back 370.86 points, to close at 23,575.72. The broader Topix index climbed 1.62 percent, or 27.56 points, to 1,725.05.
"A rebound in US shares as well as the yen's decline helped revive market momentum," Yoshihiro Okumura, general manager at Chibagin Asset Management, told AFP.
US equities ended higher on Monday, bucking a downward trend in Europe and Asia after the US killing of a top Iranian general last week.
Since he ordered a drone strike that killed Qasem Soleimani, US President Donald Trump has warned of "major retaliation" if Tehran takes revenge, triggering a sell-off in stocks and a spike in crude prices.
"Concerns about the Middle Eastern situation still remain but risk aversion will likely ease given the calm in dollar-yen trade," Okasan Online Securities said in a commentary.
Markets remained cautious but investors were "clearly in wait-and-see mode" now, said Tapas Strickland, director of economics and markets at National Australia Bank.
The Japanese currency had soared on safe-haven buying but later eased somewhat.
The dollar was trading at 108.48 yen in Asian afternoon trade against 108.40 yen in New York Monday afternoon.
In Tokyo individual stocks trade, Sony surged 3.16 percent to 7,655 yen and market heavyweight SoftBank Group gained 1.68 percent to 4,646 yen.
Toyota jumped 1.98 percent to 7,715 yen after unveiling plans to build a fully sustainable prototype city in central Japan with a fully connected ecosystem.
Nissan gained 1.75 percent to 636.5 yen after it slammed former chief Carlos Ghosn for jumping bail, vowing continued legal action against him.
Shipping companies bounced back from recent falls, with Nippon Yusen rising 0.36 percent to 1,931 yen and Mitsui OSK Lines up 0.17 percent at 2,903 yen.