This is an absolutely great series and it really deserves 5 stars. The anime itself revolves around 2 twins, Rin and Yukio, who, as you will have learnt watching the first part, are the sons of Satan himself. Despite this, both boys always strive to do the right thing. The second part of season 1 shows us how Satan came to be the twins' Father. I really hope there will be a second season. So why only 3 stars? you ask, well this is because the set that I received only contained the 12 episodes and the OVA was completely missing. Amazon sent me a replacement copy but this was exactly the same as the first, with no OVA. The box in the picture is different to the one I received. The one I received had all of the characters displayed on the front so, I was wondering if Amazon are sending out a defective earlier edition. Either way the description on the box is totally wrong and for that reason I have deducted 2 stars.