Rino Sashihara, a leading Japanese idol singer, will leave the all-girl musical group HKT48, an affiliate of the country's entertainment giant AKB48, next year, she said Saturday.Sashihara, a 26-year-old four-time winner of the AKB48 family's annual popularity contest, made the announcement during a concert in Tokyo by the group based in Fukuoka, southwestern Japan."I decided (on leaving) a long time ago," a tearful Sashihara told the audience during the concert.[Supplied photo]Sashihara's last concert will take place at Yokohama Stadium on April 28, 2019, and she will take part in an event…READ FULL ARTICLE