I'd like to point out how symbolic it is for Calli to chose to sing her first song in 3D with an Holostar member. Because, tell me if I'm wrong, but I think this is the first time ever we see Hololive and Holostar on the same stage together in 3D ? And even tho it's obvious that this is a really good thing for Holostar, and I am so happy for them and hope some people will check them out after this performance, I believe it is a good thing for the HoloEn branch too. Like, you see, it's basically saying that they follow the step of Hololive JP branch, the general format was kinda similar to what we already have seen before - play with friends and then concerts - and En, Id and Jp all got there time to shine BUT, with that one single move, starting with spiral tone, it's like saying : "we, at HoloEn, are free from the (understandable) limits of HoloJp. If we want to share the stage with Holostar, we do. If I want to sing 2 songs with Suisei and not having another guest instead, I can". And even tho that may be a weird extrapolation from me, I find it sooooo cool and badass. With this concert Calli really opened the way in the best possible manner for the upcoming 3D streams of En (and Id too but I wasn't that afraid for Id since they appear to be so free in what they do, I love it).
Well, all that to say : sasuga Dad. (And Rikka to, bless him and his wonderful voice)