I guess afterall Sakura image is just all in Haruki's head. And I think she's going to relive the moment that Sakura dies by finally remembering the cause...
But something seems off to me, Haruki said she's going to be 33 years old, and her meeting with Sakura was in the college's entrance day - which means she could have been 18-19 years old at that time.
If placing 10 years back according to Sakura's diary that is 2011 - their first time meeting, that wouldn't make sense...
Sakura dying at 28 years old should mark the 10th year of them...