I don't know if the upcoming 2nd crossover collaboration will be Arknights since the global version of Blue Archive, which is published by Nexon, has done Livestream with Hololive EN and Hololive ID. And since we all know how the frosty the relationship Hololive has with the Chinese fans to the point they stop doing any Arknights Livestream and Blue Archive has a Chinese version for China, they might go for something safe like an anime with guns like Lycoris Recoil or which I hope but doubt it will happen, Kino's Journey.