In some ways this episode just showed off the insane Shirou harem power. Kind of a fun thing to see from Illya's point of view. She has her view of Shirou and his life, but it's a reminder that he's got a lot going on that she isn't aware of.
This was just pure hilarity and chaos, especially near the end. Even ice-cream seller Bazett was involved in this
.
The birthday scene itself was nice and I like what they did with it. A good moment to tap into the further mystery that is Miyu and actually Shirou some nice moments and lines.
Ruby just doing a great just trolling. That truth serum really gave some hilarious comments towards Luvia and Rin
.