15 episodes is uncommon ... But it's a good thing! At least with Netflix scriptwriters don't have to force themselves to write more episodes to fit the two episodes per week thing
I watched a version with terrible subs, wake me up when someone made a compilation of the episodes put together with GOOD SUBS (the ones currently available suck, and you can tell because the names aren't correct, I think it was auto translated from chinese subs)
You can watch it at your own rhythm, gosh ...