Japanese stocks took their lead from an overnight jump in U.S. tech shares ahead of earnings from Amazon.com and Alphabet Inc later in the day.
In addition, many Japanese companies are reporting earnings this week, and some investors are betting that a gradual recovery in the global economy will lift profits.
Worries about a short-squeeze triggered by U.S. retail investors shook global markets last week, but volatility has abated this week.
Stocks also benefited from hopes for more U.S. economic stimulus and a rising number of U.S. coronavirus vaccinations.
“U.S. markets are starting to settle down, so we can turn our attention back to earnings and fundamentals,” said Takashi Nishizawa, head of research at Nomura Securities.
“The U.S. economy is on a stable footing. There’s optimism about earnings for the U.S. tech sector and Japanese manufacturers.”
Leading gains on Topix, Central Japan Railway Co rose 3.31 per cent, followed by Sony Corp gaining 3.05 per cent.
The biggest decliners were Keyence Corp and Hoya Corp, falling 2.12 per cent and 1.81 per cent, respectively.
The Japanese government is expected to extend a state of emergency for Tokyo and surrounding cities later in the day to curb a spike in coronavirus infections, but investors shrugged this off as they focused on the earnings outlook.
There were 154 advancers on the Nikkei index, against 68 decliners.
The volume of shares traded on the Tokyo Stock Exchange‘s main board was 1.03 billion, compared with the last 30-day average of 1.16 billion.