Good for Yukiya that he got Miku into his room! It must have been so nerveracking inviting her in the first place, but he also had to suffer the embarrassment of having his messy room be seen.
But who cares about that? He got Miku to cosplay as his favorite character! He's killing two birds with one stone by seeing that!
I wonder if Yukiya really got it from a Konbini lottery?