Awesome OVA!It was very funny i laughed a lot!
So starting from the pool part,Yuu was soo cute with that white socks to the kness (i just love girls with high socks),she was sooo cute ^^
As always i feel bad for Aikawa,he always takes with the bamboo in the a** even if they all love him :D
When Yuu said that she didn't knew if it would be better or not if she hasn't born...i was soo sad watching her sad face,because it's very sad to know/think that you shouldn't have born...I don't know how Aikawa hold himself to not tell her (Yuu we know that this is your birthaday,and we've made a party for you with presents,we love you!).She was so sad thinking that they didn't knew about her birthday :/
And the final was amazing,when they all felt asleep and Yuu found that letter(which was in the box with the cup),when she read it she was soo happy and shy/embarassed,because i think it was the best present that someone could give her,because what he said there (I'm happy that you've born,because if not,i couldn't be here in your birthday party.Thank You) Sooo cute ^^ I this case i would like to say that these words were "golden words",she was so happy!!! <3
I hope to see a 3rd season of Kore Wa Zombie Desu Ka? Of The Dead,i wan't tou see Yuu and Aikawa as a couple,when they will say to each other "I love You",or something like that! :D
So this OVA was not so fanservice-laden which was nice. And I dind't know that Cube was a thing in japan. Best part was when Eu just dropped everyone when it came to her age. A classy move. But the dubbed version left me hangig there, because they have forgotten to sub her writing...