The seven deadly sins starts with the princess of the lioness kingdom trying to gather the seven deadly sins a group of knights who were legendary to stop the corrupt holy knights who were abusing their power.At first this would seem like your average shounen full of the standard cliches and while it does have a lot of cliches the execution makes it enjoyable.The series is heavily influenced by Arthurian legend and Celtic mythology so if you like those you will be a fan of this.The whole race dynamic is also interesting.There are fairies,giants,humans,demons and goddesses.The characters are also really likable.There are tragic backstories and situations which you don't normally see in shounen and the execution is almost perfect.You can also theory craft for hours on this as this series has many mysteries.The art is also very unique and the fights are epic.And unlike other shounen the characters in the story don't need the main character to save them everytime.I highly recommend trying this series you will not be disappointed you will be hooked to this very quickly.