The Battle for Ohashi Bridge

I find this hard to believe myself, but... It seems that a giant ghost has appeared at Ohashi bridge and is attacking those who cross and stealing their weapons. If it were a Yokai, that would be one thing... but how can a ghost attack people? William, will you get to the bottom of this for me?

Completion Edit

Hmm... so that was it. This smells like the work of the man who came from your distant land in pursuit of you. To toy with even our greatest ancestors... Just how far will he go to make a fool of this country? William, on behalf of the land of the rising sun. I thank you.

Objective Edit

Missing information.