Great for fans (and people who can understand Japanese)
This game is described as a dialogue action battle. That's an accurate description. You'll start out using Araragi Koyomi (the main character from the novels) and play through the episodes from the anime. You'll arm yourself with various quotes that you'll then use to counter the words of your opponent.
I won't lie: if you've watched the anime you'll have a good chance of just winging it. No matter what, some command of Japanese is necessary, otherwise you'll wind up with some really disjointed conversations (e.g. using "You are an idiot" to reply to "Good morning!")
As you progress you'll unlock other characters and you can use them in a free-style battle mode, perfect for characters who didn't really meet in the anime (e.g. Araragi's sister Karen vs his girlfriend Hitagi).
This game might seem boring for someone who didn't enjoy the conversation element, but for fans of the series I'd recommend it.