Heavy spoilers warning. This question is based on the VN, it should be applicable to the anime, though I'm not sure.
In Rin's 2nd route, she is sent to another school where
many students died in a bus crash, and the rest are traumatized as a result. Rin is supposedly sent to help them.
However, as we know,
the bus crash actually happened to them.
With that in mind, where is Rin actually sent?
The place she is sent to does not exist, how does Kyousuke create something that should be an entirely different school with different people? Did he at all? What does Rin actually experience there? It breaks her mind as we can see in Refrain, but I don't know what it actually is that she experiences there.