"The Supreme Court is generally reluctant to exercise the powers of judicial review given to it by the constitution, in large part because of unwillingness to become involved in politically sensitive issues. When decisions have been rendered on such matters as the constitutionality of the Self-Defense Forces, the sponsorship of Shinto ceremonies by public authorities, or the authority of the Ministry of Education to determine the content of school textbooks or teaching curricula, the Court has generally deferred to the government."
"The Supreme Court of Japan has been described as the most conservative constitutional court in the world, and for good reason ...Since its creation in 1947 [the court] has struck down only eight statutes on constitutional grounds. By way of comparison, Germany’s constitutional court, which was established several years later, has struck down over 600 laws."
"The Supreme Court is generally reluctant to exercise the powers of judicial review given to it by the constitution, in large part because of unwillingness to become involved in politically sensitive issues. When decisions have been rendered on such matters as the constitutionality of the Self-Defense Forces, the sponsorship of Shinto ceremonies by public authorities, or the authority of the Ministry of Education to determine the content of school textbooks or teaching curricula, the Court has generally deferred to the government."
"The Supreme Court of Japan has been described as the most conservative constitutional court in the world, and for good reason ...Since its creation in 1947 [the court] has struck down only eight statutes on constitutional grounds. By way of comparison, Germany’s constitutional court, which was established several years later, has struck down over 600 laws."
So what's the chance? Not very high.