Ya know what? I think that new boi's role is to be a 'wingman' for Yukino and Nobara. I mean that cliche scene where Yukino will probably get confessed to or not, atleast get introduced to each other and then Nobara seeing them , then she'll get those uncomfortable doki dokis, then she'll realized her feelings, and the rest, u know it.
Still, I'm hoping for unexpected things to happen, that good unexpected thing I guess.