By Teppei Kasai TOKYO (Reuters) – SoftBank Corp has no plans to invest in messaging application Line Corp, Ken Miyauchi, chief operating officer of Japans No. 3 mobile carrier, told reporters on Friday. Line plans to hold a media event about its business strategy on Oct.9. That has fuelled some expectations in the banking industry that Line will unveil a strategic alliance with SoftBank and Alibaba Group Holding Ltd after attracting investment from them, the Maeil Business Newspaper reported on Thursday. …