@Galder Because all girls had their ending now and Yunas past and regrets are getting revealed? What will be left then? A turbo ending like Kishuku Gakkou no Juliet?
Okay the story was about a "forbidden love" in the school but it could have been moved further to "against the old world" but maybe the mangaka or the producer had the opinion that this wouldn't sell. So they run through the years to show the Marriage-Ending everyone wants to read. Maybe even...