Zombie Loan was a very short anime, but partly I think that's a good thing. If it had continued for an extra 50 episodes it probably would have become a series full of fillers and other rubbish things still managing to cut a lot of things from the manga. But as the manga is still ongoing I think hope for a second series is good, but it will probably be short too (a lot like Vampire Knight and Vampire Knight Guilty). Overall it is a good anime and you should watch it if you have a day spare.