The "TPP11," which includes a provision to extend the term of protection to 70 years, will enter into force on December 30, 2018.

In Japan, the term of copyright protection will, in principle, be 70 years after the death of the author (or 70 years after publication for works published anonymously, under a pseudonym, or in the name of a corporate body).

Copyrights that have already expired at the time of enforcement will not be revived (principle of non-retroactivity of protection).

Consequently, no works will newly enter the public domain for the next 20 years.

From Japan Library Association: https://www.jla.or.jp/hogokikan-encho/#:~:text=%E4%BF%9D%E8%...