Move to strengthen military cooperation follows a meeting in Tokyo earlier this week between South Korean President Yoon Suk Yeol and Japanese Prime Minister Fumio Kishida — the first such summit in 12 years.
About 800,000 students and workers across the country expressed desire to enlist or re-enlist in the military to counter US, local media report.
The leaders of Japan and South Korea promised to resume ties in a historic summit as the two neighbours seek to confront threats from North Korea and rising concerns about China.
The Asian neighbours have for years been locked in a bitter dispute over Japan's use of wartime forced labour during its occupation of Korea.
The visit comes hours after North Korea fired a long-range ballistic missile.
The planned trip comes after South Korea announced last week its companies would compensate victims of forced labour under Japan's colonial rule from 1910-1945.
Last week, North Korean leader Kim Jong Un ordered his troops to be ready to repel what he called the “frantic war preparations moves” by his country’s rivals.
The launch came hours before South Korea and the United States were set to kick off their largest joint exercises in five years amid nuclear-armed Pyongyang warning such drills could be seen as a "declaration of war".
Kim Jong-un orders military to intensify drills to deter and respond to "real war" if necessary, state media say, after leader oversees drill simulating attack on South Korean airfield.
The plan involves a foundation compensating victims using funds from South Korean firms that benefited from Japan's 1965 reparations package, without a new apology from Japan.
The United States and South Korea say the exercises are in self-defence and are necessary to counter the rising threats from North Korea's ballistic missile and nuclear weapons programmes.
North Korea has threatened to take “unprecedently” strong action against such exercises.
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