The plan is to reduce nuclear power but there is no total phase-out plan with a fixed deadline at present
Japan originally had a plan to "enable nuclear power generation to be at zero during the 2030s" as stated by dw.com:
"The government will introduce every possible policy resource that would enable nuclear power generation to be at zero during the 2030s," a government paper released on Friday said.
5 days later The Guardian announced the government's plan to remove nuclear power had been dropped:
Japan has effectively abandoned a commitment to end its reliance on nuclear power by 2040 amid pressure from the country's business lobby, dropping a deadline recommended by a cabinet panel only days ago.
However, The Conversation has cited 2 reports which state that a rather significant (47.9-73%) portion of people surveyed support a gradual phaseout of nuclear power:
In a 2015 poll by the pro-nuclear Japan Atomic Energy Relations Organization, 47.9 percent of respondents said that nuclear energy should be abolished gradually and 14.8 percent said that it should be abolished immediately. Only 10.1 percent said that the use of nuclear energy should be maintained, and a mere 1.7 percent said that it should be increased.
Another survey by the newspaper Asahi Shimbun in 2016 was even more negative. Fifty-seven percent of the public opposed restarting existing nuclear power plants even if they satisfied new regulatory standards, and 73 percent supported a phaseout of nuclear power, with 14 percent advocating an immediate shutdown of all nuclear plants.