Board Thread:Questions and Answers/@comment-114.4.76.235-20160216113717/@comment-25386610-20160216152233

You can't restart on an existing Line account even if you remove it and then reallow it for Line, it'll just be at where you left off.

But you can delete the Line account^ but it'll delete everything, or you can just create a new one if you ever want to use your old one.