Board Thread:Questions and Answers/@comment-36.77.78.238-20160801172443/@comment-26501688-20160804044730

What levels are your tantou now? If they're around 30-40+, you could play using other swords to unlock all worlds until you get access to world 6, where tantou have a greater advantage. Even with KBC there, level disparities don't really matter anymore if you're using a team of tantous (you can then use high-level tantous to babysit low-level tantous in world 6).

There's also the option of closing and reopening the game if you encounter KBC and don't want to take them on.