Four topics dominated Japan's non-Twitter news cycle for the last quarter of 2017. Two involved sports: the signing of 23-year-old baseball superstar Shohei Otani to play for the Los Angeles Angels of the American League; and the resignation of sumo grand champion Harumafuji after assaulting a younger wrestler, which set off a three-way power struggle between headstrong stablemaster Takanohana, the Japan Sumo Association and a group of Mongolian wrestlers who currently dominate the sport.