“I Will Not Work Overtime, Period!” features a heroine, Yui Higashiyama, center, who fights for her right to leave work in time for happy hour.Credit...TBS TOKYO — Last month, as Americans tuned in to the final episode of “Game of Thrones,” Japan was indulging in its own television fantasy world. In this one, a woman dares to leave work at 6 p.m. sharp. The determination of Yui Higashiyama, a 30-s