There're no definite answers to the case...This has been discussed dozen of times with Kurugaya's true ending.
In Sasami's case,it's like a what if scenario when Riki choose Sasami.
You know ,like if you can continue playing after refrain and get to choose your heroine all over again.Sasami's route is among the possible story this time around.
It might or might not happened,I mean...
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