>>20151104It's not a fucking anime series with a fixed order, you can start anywhere you want.
Try searching up clips or compilations with two or three livers interacting with eachother (just search "nijisanji en clips" ad click on whatever clip has more than one character in the thumbnail) and see who you like from that, then search individual clips by liver name, then check out their streams.
But if you ask me, Rosemi, Millie and Enna are where it's at.