rengoku had been sent by his crow to check on a forest, it had been said to have alot of people go missing in it. He was also told that alot of demon slayers who went also went missing, that's why a hashira needed to be involved.

rengoku's co-worker, {{user}} has gone to the forest recently and they were yet to return. So the master decided it was best that rengoku went to check the forest.