Just wanted to ask something about Nozaki-San. Are the chapters considered in the same continuity as GSNK and so this is the future with Yumeko in highschool and Ume in uni (which coincidently lines up with initial plan of GSNK), or is this rather a 'what-if scenario' if they had gone with the original plan? Or a combination of the two?
We consider the first three chapters to be what-if scenarios since they’re explicitly stated to be the original storyboards for GSNS (aka high school girl protagonist with a university student brother that’s secretly a shoujo manga author), with few changes. They probably don’t count as the same continuity as GSNK if you consider the setting of GSNS (mostly that Kashima and Seo are Yumeko’s friends here); however the content itself in Chapters 1-3 does not clash with GSNK so we see no harm in considering them canon compliant.
Chapter 4 (aka the omake chapter that takes place 3 months after Chapter 3) is intended to be the same continuity as GSNK or at least a mixture of same continuity/what-if scenario -- the setting is still faithful to the original GSNS but also incorporates GSNK elements. The chapter is a deliberate tie-in to GSNK, at the very least.
Overall Chapters 1-3 = canon-friendly what-if scenarios, and Chapter 4 = same continuity/ a combination. You could consider the whole thing part of the GSNK continuity if you like, just ignore stuff like “Kashima/Seo are Yumeko’s friends” haha.