In case you are wondering whether or not you should watch the OVA: Go for it! It has the same basic "vibe" as the original two seasons - the only difference being that the secret behind it all is already known to the watcher. However, I don't think that's too bad of a thing: It's the Hinamizawa we all know and love, just going down a different path leading to its inevitable destruction. Also, we get to see a blood-sprinkled Rena in action with her cleaver knife, Keeichi-Kun using Satoshi's bat, and overall just a whole lot of insanity. All in all, it's something like a short version ofHigurashi that lets you reconnect with everything important.