The special mini series is a story about younger Maya and Ami finding a mystical snake creature. Considering their love for the occult, they treat is as if they've picked up a street dog or cat. It's fairly cutsie and for the most part void of the intensity of the main show, however, if you have half an hour to kill why not give it a watch. It's not a must see, but I'd still recommend it ease you out of the completion of the series.