On this episode, Hinami's gets killed by the investigators and Ken can't do anything. Later, Touka makes a plan against the investigators.
So Ken was pretty much weak and useless which isn't surprising since there are certain situations he can't deal with. Also it seems Touka might be an idiot for starting her vengeance. Anyway, will Ken and Tokua be able to fight the investigators? Overall, a set up for the next plot.
Conclusion: A set up for the next plot.