Think of these as bonus information episodes rather than giving it a 'season 2' stigma. They greatly expanded on Keith and with the help of (admittedly) bland extras, set up a straight-forward story, delivered quite an investigation and stayed grounded to its original style. If you enjoyed the first season there really is not much reason to not enjoy these OVAs, plus there is clearly room for continuation If I had to come for anything, it would be the uselessness of the new characters outside of connecting the obvious plot holes BUT I will say they could have purposely done that for the sake of cuttingthe number of episodes in half and opening up a path for their development in a sequel