A former heavy metal drummer and biker is not someone the world would expect to become a prime minister of Japan. Particularly if that someone is a woman. But that is what is likely to happen tomorrow. Last month, 64-year-old Sanae Takaichi became the first female head of the Liberal Democrat Party – the party that has ruled Japan for all but 4 of the last 70 years – and soon she will be Japan’s first female prime minister too. On Monday, Takaichi signed off on a coalition pact with the right-leaning libertarian Japan Innovation Party (Ishin). They have replaced...