https://www.youtube.com/watch?v=qOi_L4b94oU&feature=youtu.be
I was right, it was 4 min episode.(4min 30 sec) Although it's a spin-off series, it had some magical change element in it such as Larimar's human form as well as Luna glasses. They do not have the jewel watch though. It seems like Luna's glasses is here to stay permanent. First episode is........okay? Although I don't know what happen.