OkazakiLeir

I'm still a bit confused at the "Stay true to my feelings (Only after completing Shirone and Yuuri)" part of the walkthrough. Does it really only appear by going through Shirone's route all over again? I'm playing Sara's route right now after finishing Shirone's and Yuuri's and it sure feels like it's a lot of legwork just to get to the alternative (?) ending if that's even what it is.